Wear these socks in conjunction with your existing footware to give yourself a real heat boost! Breathable polypropylene material wicks moisture away from the body Brushed ´fleece´ inner providing excellent thermal qualities Dries very quickly after use and washing due to the hydrophobic (water repellent) nature of polypropylene Wear beneath Hot Socks as an insulating layer during winter for incredible warmth Ideal for a range of outdoor activities in the colder months including road cycling, mountain biking, kayaking and skiing UK 3.5 4 4.5 5 5.5 6 6.5 7 7.5 Europe 36.5 37 38 38.5 39 40 40.5 41 42 USA 4.5 5 5.5 6 6.5 6.5 7 7.5 8 Rooster 2XS 2XS XS XS S S S M M   UK 8 8.5 9 9.5 10 10.5 11 11.5 12 Europe 42.5 43 44 44.5 45 45.5 46 46.5 47 USA 8.5 9 9.5 10 10.5 11 11.5 12 12.5 Rooster ML ML ML L L L XL XL 2XL