The Runderwear Anti-Blister Eco Running Socks are an updated version of our award-winning, double-layered socks designed specifically to reduce the risk of blisters during your run. The new version of the Anti-Blister Socks is now made using 50% recycled yarn & offer a very slightly lighter feeling version than the original, whilst still offering the same technology & protection that have made our socks a go-to for runners across the globe. Fabric Composition: 50% Recycled Polyamide 27% Tactel 19% Polyamide 3% Elastodine 1% Elastane Product Care: Warm machine wash up to 40°C Wash with similar colours, inside-out Warm tumble dry Do not bleach Size Guide Women's Sizes UK EU US AU S 4-6 37-39 6. 5-8. 5 6-8 M 6. 5-8. 5 39. 5-42. 5 9-11 8. 5-10. 5 Men's Sizes UK EU US AU S 4-6 37-39 5-6. 5 4-6 M 6. 5-8. 5 39. 5-42. 5 7-9 6. 5-8. 5 L 9-11 43-46 9. 5-11. 5 9-11 XL 11. 5-13 46. 5-48 12-13. 5 11. 5-13