1000 Denier Cordura. 400 Gram Thinsulate Ultra Insulation. Drainage Vents Move Water Out and Prevents Debris from Entering and Enhancce Breathability. Flash and water-Resistant leather uppers withstand fire hazards and rigors of Sea-to-Land warfare. Lycra Tongue. Made in the USA, Berry Complaint. Proprietary High-Walled Vibram Soles with Perforated Airport Cushion Footbeds and PU Midsoles. PTFE coated for flame-resistance. Rocky Airport Footbed. Steel protective Toe. SuperFabric instep Panels Prevent Early boot Failure from Rope Burn. Triple stitched for durability. Wicking Dri-Lex Lining and Stretch Lycra Tongues Hug feet for Secure Fit.