The perfect go-to socks for the kids! These trainer socks come with an ultra-comfortable cotton rich quality - great for slipping on when wearing trainers. Available in a pack of 5, these socks are size 4-6.5. These socks are available in a black or white pack.. 1 x Kids Zone Trainer Socks Cotton Rich 5 Pairs. Size 4-6.5. Extended heel zone. 60% cotton, 38% polyester, 2% elastane