Size-Fit Summary: Size XS = US Size 5-7. Size S = US Size 8-10. Size M = US Size 11-13. Size L = US Size 1-3. Size XL = US Size 4-6. Mini puddle-jumpers will love Hunter’s new limited-edition Peppa Pig Boot Socks, which are designed to slip inside our kids sized rain boots. With a cozy blue fold-down cuff that features an embroidered Peppa Pig, these socks will make our natural, vegan rubber rain boots even more comfortable on long wet walks.