Endura fs260 pro sl winter socksenduras fs260 pro sl winter socks have been updated with a 200 needle construction for improved performance and support without creating additional bulk the soft feel meryl skinlife yarn with anti bacterial finish and flat seam toe come together to create a functional yet warm sock featuresmaterial 47 polyester 20 nylon 20 elastane 10 silk 3 woolluxury primaloft silk blendpadded toe and metatarsal terrystretch arch supportlong cuff for extra warmthb