When you take off your Bombas at the end of the day, you realize you need another pair for tomorrow. That's where this Four-Pack comes in. Sometimes you need a thinner pair of Bombas. Flat-knit construction means they fit in just about any shoe in your closet, including the ones without much wiggle room. One purchased = one donated. Women's Lightweight Calf Sock 4-Pack - Ecru Black Mix - Medium - Bombas