Endura mtr socksenduras mtr socks are the ultimate mountain racing performance socks they feature extra warm thermolite and variable engineered zones for optimal breathability while terry soles seamless toes and lycra support zones add maximum comfort for all day wear featuresmaterial 69 polyester 18 elastane 10 nylon 3 cottonextra warm thermolitevariable engineered zones for optimal breathability and comfortterry soledurable nylon heel and toe sectionslycra support zone at archs