SMALL fits Women Size 6-8 and MEN fits Size 5-7 MEDIUM fits Women 8-10 and Men fits Size 7-9 Care Instructions: Solemate socks will shrink a little in their first washing; however, they are knit on the larger size to accommodate this and do stretch out once worn again. We recommend you machine wash your socks on gentle. No bleach. Dry on cool.For a more eco-friendly cleaning process, we recommend you hand-wash your socks and air-dry them. *Air-drying your clothes can reduce the avg. household’s carbon footprint by up to 2,400 lbs. a year! Solemates are B Corp™ Certified! So what does that mean? B Corp™ Certification is to business what Fair Trade certification is to coffee or USDA Organic certification is to orange juice. Certified B Corps™ are for-profit companies certified by the nonprofit B Lab to meet rigorous standards of social and environmental performance, accountability, and transparency. A company has to meet a minimum performance benchmark aggregated across all categories to become certified. Today, there is a growing community of more than 2,200 Certified B Corps from 50+ countries and over 130 industries working together toward 1 unifying goal: to use business as a force for good. Being Certified as a B Corp™ officially recognizes the commitment that has been part of Solmate Socks' DNA since it was founded 20 years ago. It shows our commitment to putting our employees, the environment, and our community ahead of the bottom line.