95% Coolmax Polyester/5% Lycra Bluesign certified approved fabric with warp & weft stretch material for excellent movement Single TLD low profile snap button with Velcro backing ensures solid closure without added bulk New improved fit with revised rear 2-way stretch panel. Stretch panel also features breathable mesh for better cooling Available for purchase as a shell only or with the TLD AIR COMP liner w/ TMF 4 hour pad