Endura womens windchill biblongsideal for cold weather cycling the endura womens windchill biblongs have a breathable windproof membrane across the front of the leg ankle and crotch with teflon ht treated thermolite for insulation and comfort features material 45 nylon 42 polyester 13 elastane knit fabric with windproofbreathable membrane on front leg and shin panels teflon ht treated thermolite provides insulation and comfort supportive mesh upper with high stretch lycra bound strap