Dark Crystal Helmet

	Dark Crystal Helmet Heavy Armor
	Type - Armor / Head

Stats:
Weight:	570
Durability:	-
P.Def.:	69
M.Def.:	0
Rarity:
MP bonus:	0
Crystallization:	Crystal (A-Grade) - 107
Grade:	A
No restrictions for item exchange.
This item included in sets:	Dark Crystal Heavy Armor Set

Item	Upgrade Type	Materials	Result
Dark Crystal Helmet Heavy Armor +10	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Fail Scroll: Enchant S-grade Armor  — 1 pcs. or Sealed Imperial Crusader Helmet Crafting Pack  — 1 pcs.
Dark Crystal Helmet Heavy Armor +11	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Fail Scroll: Enchant S-grade Armor  — 2 pcs. or Sealed Imperial Crusader Helmet Crafting Pack  — 1 pcs.
Dark Crystal Helmet Heavy Armor +12	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Fail Scroll: Enchant S-grade Armor  — 2 pcs. or Sealed Imperial Crusader Helmet Crafting Pack  — 1 pcs.
Dark Crystal Helmet Heavy Armor +13	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs.
Dark Crystal Helmet Heavy Armor +14	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (30% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Heavy Armor +15	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (40% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Heavy Armor +16	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (80% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Heavy Armor +17	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Heavy Armor +18	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 2 pcs.
Dark Crystal Helmet Heavy Armor +19	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 3 pcs.
Dark Crystal Helmet Heavy Armor +20	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 4 pcs.
Dark Crystal Helmet Heavy Armor +21	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 5 pcs.
Dark Crystal Helmet Heavy Armor +22	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 6 pcs.
Dark Crystal Helmet Heavy Armor +23	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 7 pcs.
Dark Crystal Helmet Heavy Armor +24	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 8 pcs.
Dark Crystal Helmet Heavy Armor +25	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Imperial Crusader Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 9 pcs.

Trader	Place	Cost	Amount of purchased items
Blacksmith Feynn	Town of Goddard	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Helton	Town of Oren	Dark Crystal Helmet  — 1 pcs.	1
Blacksmith Helton	Town of Oren	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Pushkin	Giran	Dark Crystal Helmet  — 1 pcs.	1
Blacksmith Pushkin	Giran	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Rupio	Giran	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Rupio	Giran	Dark Crystal Helmet  — 1 pcs.	1
Blacksmith Wilbert	Town of Aden	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Wilbert	Town of Aden	Dark Crystal Helmet  — 1 pcs.	1

Trader: Blacksmith Pushkin (Giran), Blacksmith Rupio (Giran), Blacksmith Helton (Town of Oren), Blacksmith Wilbert (Town of Aden), Blacksmith Feynn (Town of Goddard)
Item	Cost
Sealed Dark Crystal Helmet	133,600 adena + castle tax Dark Crystal Helmet Heavy Armor  — 1 pcs.

Amount of crystals by enchantment level:
Enchanting	Crystallization	Fail Ench.	Enchanting	Crystallization	Fail Ench.
+0	107		+12	377	323
+1	116		+13	404	350
+2	125		+14	431	377
+3	134	80	+15	458	404
+4	161	107	+16	485	431
+5	188	134	+17	512	458
+6	215	161	+18	539	485
+7	242	188	+19	566	512
+8	269	215	+20	593	539
+9	296	242	+21	620	566
+10	323	269	+22	647	593
+11	350	296	+23	674	620

You can get at the opening by double-clicking on item:

Container
File:Item 71925.jpg	[[|]]
	Dark Crystal Heavy Armor Set
	Helmet Crafting (B-grade and higher)

	Dark Crystal Helmet Light Armor
	Type - Armor / Head

Stats:
Weight:	570
Durability:	-
P.Def.:	69
M.Def.:	0
Rarity:
MP bonus:	0
Crystallization:	Crystal (A-Grade) - 107
Grade:	A
No restrictions for item exchange.
This item included in sets:	Dark Crystal Light Armor Set

Item	Upgrade Type	Materials	Result
Dark Crystal Helmet Light Armor +10	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Fail Scroll: Enchant S-grade Armor  — 1 pcs. or Sealed Draconic Leather Helmet Crafting Pack  — 1 pcs.
Dark Crystal Helmet Light Armor +11	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Fail Scroll: Enchant S-grade Armor  — 2 pcs. or Sealed Draconic Leather Helmet Crafting Pack  — 1 pcs.
Dark Crystal Helmet Light Armor +12	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Fail Scroll: Enchant S-grade Armor  — 2 pcs. or Sealed Draconic Leather Helmet Crafting Pack  — 1 pcs.
Dark Crystal Helmet Light Armor +13	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs.
Dark Crystal Helmet Light Armor +14	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (30% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Light Armor +15	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (40% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Light Armor +16	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (80% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Light Armor +17	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Light Armor +18	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 2 pcs.
Dark Crystal Helmet Light Armor +19	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 3 pcs.
Dark Crystal Helmet Light Armor +20	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 4 pcs.
Dark Crystal Helmet Light Armor +21	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 5 pcs.
Dark Crystal Helmet Light Armor +22	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 6 pcs.
Dark Crystal Helmet Light Armor +23	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 7 pcs.
Dark Crystal Helmet Light Armor +24	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 8 pcs.
Dark Crystal Helmet Light Armor +25	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Draconic Leather Helmet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 9 pcs.

Trader	Place	Cost	Amount of purchased items
Blacksmith Feynn	Town of Goddard	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Helton	Town of Oren	Dark Crystal Helmet  — 1 pcs.	1
Blacksmith Helton	Town of Oren	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Pushkin	Giran	Dark Crystal Helmet  — 1 pcs.	1
Blacksmith Pushkin	Giran	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Rupio	Giran	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Rupio	Giran	Dark Crystal Helmet  — 1 pcs.	1
Blacksmith Wilbert	Town of Aden	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Wilbert	Town of Aden	Dark Crystal Helmet  — 1 pcs.	1

Trader: Blacksmith Pushkin (Giran), Blacksmith Rupio (Giran), Blacksmith Helton (Town of Oren), Blacksmith Wilbert (Town of Aden), Blacksmith Feynn (Town of Goddard)
Item	Cost
Sealed Dark Crystal Helmet	133,600 adena + castle tax Dark Crystal Helmet Light Armor  — 1 pcs.

Amount of crystals by enchantment level:
Enchanting	Crystallization	Fail Ench.	Enchanting	Crystallization	Fail Ench.
+0	107		+12	377	323
+1	116		+13	404	350
+2	125		+14	431	377
+3	134	80	+15	458	404
+4	161	107	+16	485	431
+5	188	134	+17	512	458
+6	215	161	+18	539	485
+7	242	188	+19	566	512
+8	269	215	+20	593	539
+9	296	242	+21	620	566
+10	323	269	+22	647	593
+11	350	296	+23	674	620

You can get at the opening by double-clicking on item:

Container
File:Item 71925.jpg	[[|]]
	Dark Crystal Light Armor Set
	Helmet Crafting (B-grade and higher)
	Old Home's Golden Chest

	Dark Crystal Helmet Robe
	Type - Armor / Head

Stats:
Weight:	570
Durability:	-
P.Def.:	69
M.Def.:	0
Rarity:
MP bonus:	0
Crystallization:	Crystal (A-Grade) - 107
Grade:	A
No restrictions for item exchange.
This item included in sets:	Dark Crystal Robe Set

Item	Upgrade Type	Materials	Result
Dark Crystal Helmet Robe +10	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Fail Scroll: Enchant S-grade Armor  — 1 pcs. or Sealed Major Arcana Circlet Crafting Pack  — 1 pcs.
Dark Crystal Helmet Robe +11	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Fail Scroll: Enchant S-grade Armor  — 2 pcs. or Sealed Major Arcana Circlet Crafting Pack  — 1 pcs.
Dark Crystal Helmet Robe +12	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Fail Scroll: Enchant S-grade Armor  — 2 pcs. or Sealed Major Arcana Circlet Crafting Pack  — 1 pcs.
Dark Crystal Helmet Robe +13	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs.
Dark Crystal Helmet Robe +14	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (30% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Robe +15	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (40% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Robe +16	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (80% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Robe +17	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 1 pcs.
Dark Crystal Helmet Robe +18	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 2 pcs.
Dark Crystal Helmet Robe +19	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 3 pcs.
Dark Crystal Helmet Robe +20	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 4 pcs.
Dark Crystal Helmet Robe +21	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 5 pcs.
Dark Crystal Helmet Robe +22	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 6 pcs.
Dark Crystal Helmet Robe +23	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 7 pcs.
Dark Crystal Helmet Robe +24	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 8 pcs.
Dark Crystal Helmet Robe +25	Special	1,000,000 adena Crystal (A-grade)  — 25 pcs. Special Armor Varnish (A-grade)  — 2 pcs.	Success Sealed Major Arcana Circlet  — 1 pcs. Bonus (100% chance) Scroll: Enchant S-grade Armor  — 9 pcs.

Trader	Place	Cost	Amount of purchased items
Blacksmith Feynn	Town of Goddard	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Helton	Town of Oren	Dark Crystal Helmet  — 1 pcs.	1
Blacksmith Helton	Town of Oren	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Pushkin	Giran	Dark Crystal Helmet  — 1 pcs.	1
Blacksmith Pushkin	Giran	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Rupio	Giran	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Rupio	Giran	Dark Crystal Helmet  — 1 pcs.	1
Blacksmith Wilbert	Town of Aden	133,600 adena + castle tax Sealed Dark Crystal Helmet  — 1 pcs. Cloth Piece  — 1 pcs.	1
Blacksmith Wilbert	Town of Aden	Dark Crystal Helmet  — 1 pcs.	1

Trader: Blacksmith Pushkin (Giran), Blacksmith Rupio (Giran), Blacksmith Helton (Town of Oren), Blacksmith Wilbert (Town of Aden), Blacksmith Feynn (Town of Goddard)
Item	Cost
Sealed Dark Crystal Helmet	133,600 adena + castle tax Dark Crystal Helmet Robe  — 1 pcs.

Amount of crystals by enchantment level:
Enchanting	Crystallization	Fail Ench.	Enchanting	Crystallization	Fail Ench.
+0	107		+12	377	323
+1	116		+13	404	350
+2	125		+14	431	377
+3	134	80	+15	458	404
+4	161	107	+16	485	431
+5	188	134	+17	512	458
+6	215	161	+18	539	485
+7	242	188	+19	566	512
+8	269	215	+20	593	539
+9	296	242	+21	620	566
+10	323	269	+22	647	593
+11	350	296	+23	674	620

You can get at the opening by double-clicking on item:

Container
File:Item 71925.jpg	[[|]]
	Dark Crystal Robe Set
	Helmet Crafting (B-grade and higher)
	Old Home's Golden Chest

Dark Crystal Helmet - Related Pages Items: Armor Sets • Weapon • Armor • Accessories • Head Accessories Armor: Heavy Armor • Light Armor • Magic Armor • Gloves • Boots • Helmets • Shields Helmets: No grade Helmets D-grade Helmets C-grade Helmets B-grade Helmets A-grade Helmets S-grade Helmets