Insayne

This is the information on all the helmets in the Crono Trigger game that you can acquire. The information is taken directly from the Chrono Trigger Nintendo Player's Guide. If you have any corrections (it's possible the book is innacurate) please tell me!

NAME	BUY	SELL	DEFENSE	USERS	NOTES
Hide Cap	─	25	+3	All	Crono begins with this.
Bronze Helmet	200	100	+8	All	Buy at the Market in A.D. 1000
Iron Helmet	500	250	+14	All	Buy at Trann Dome A.D. 2300
Beret	700	350	+17	Ayla, Marle, Lucca	Buy at the market in A.D. 600
Gold Helmet	─	600	+18	All	Find in Denadoro Mts. in A.D. 600, given to Crono by the Captain
Rock Helmet	3 Horns, 3 Feathers	1,000	+20	All	Trade in 65000000 B.C.
Cera Topper	─	1,250	+23	All	Find in 65000000 B.C. in the Tyrano Lair
Taban Helmet	─	─	+24	Lucca	Get it from Taban at Lucca's house
Glow Helmet	2,300	1,150	+25	Males	Buy in Terra Cave 12000 B.C.
Lode Helmet	6,500	3,250	+29	All	Buy in Kajar in 12000 B.C.
Doom Helmet	─	4,750	+29	Magus	Buy in Kajar in 12000 B.C., Magus joins with this
Sight Cap	20,000	10000	+30	All	Prevents 'Chaos' spells, can be bought at Fiona's Shrine in A.D. 1000 if you complete Event 3
Time Hat	30,000	15,000	+30	All	Prevents slow and stop
Memory Cap	20,000	10,000	+30	All	Find on Death Peak, buy from Fiona's Shrine. Prevents lock
Aeon Helmet	7,800	3,900	+33	All	Buy in the Last Village in 12000 B.C.
Dark Helmet	─	6,000	+35	Males	Reduces "Shadow" damage by 50%
Haste Helmet	─	6,000	+35	All	50% less time between attacks
Mermaid Cap	─	8,000	+35	All	Charm from a Blue Beast, water damage reduced by 50%
Rainbow Helmet	─	6,000	+35	All	Charm from a regular Beast, lightning damage reduced by 50%
Safe Helmet	─	─	+38	All	Physical damage reduced by 1/3
Prism Helmet	─	5,000	+40	All	Requires the Rainbow Shell, made by Melchior if you so choose.
Vigil Hat	50,000	25,000	+45	All	Find in Black Omen, buy from Fiona's Shrine
Gloom Helmet	─	6,500	+42	All	Find in Ozzie's Fort, Def +9, and locks status
Ozzie Pants	─	─	+45	All	Charm it from Great Ozzie