Under Armour's 3 Pack Performance Tech Low Cut Socks in Black/Jet Grey are designed for both comfort and durability. The breathable material wicks away sweat, keeping your feet fresh throughout the day. The locked-in fit design ensures the socks stay securely in place, while the medium cushioning provides added comfort. The built-in arch support ensures stability, making these socks perfect for athletes and those on the go. Size: M=4-7.5 UK, 36.5-42 EU, 7-8.5 US. L=7.5-12 UK, 42-47.5 EU, 8.5-13 US.