4 pack bamboo socks classic gradient4 pack of premium bamboo men's socks in a classic gradient. Four wearable shades from stone gray through anthracite and navy blue to matte black a complete basic collection. Bamboo fiber provides natural breathability, moisture management, and a silky soft feel against the skin all day long. Material: 80% bamboo viscose, 17% polyamide, 3% elastane Height: mid calf length (classic dress sock height) Ribbed comfort cuff no tightness Reinforced heel and