COMFORT: Bamboo fabric allows feet to stay cool in the heat and keep comfortably warm on colder days. Bamboo fiber is very breathable and effectively wicks moisture away from the skin. | QUALITY: These Black soft crew socks have non-binding top, reinforced toes and heels which make it durable. Our socks are stay-up well, not too thick or too thin, suitable for all seasons home office everyday use. | CARE INSTRUCTIONS: Please, wash on gentle cycle in warm water, max 30°C/86°F. Tumble dry on low setting (not exceeding 30°C/86°F), but it is better to line dry only. The socks may seem to have shrunk after washing but they'll regain their original form when you wear them. Our socks don't easily shrink or lose their shape after washing.