AC4® Active Comfort Sock Color:White Complete with legendary BIRKENSTOCK design

Complete with legendary BIRKENSTOCK design elements

GEL™ TECHNOLOGY CUSHIONING

Medical Grade Compression

Honeycomb™️ Insulated Cap for maximum temperature retention

AC4® Active Comfort Sock Color:White Complete with legendary BIRKENSTOCK designThe AC4 Active Comfort Sock uses two of OS1sts signature technologies for the ultimate comfort experience. The AC4 is built with nano bamboo charcoal cushion where it counts and OS1sts cooling Skin Thin Technology for temperature regulation. Made for everything from exercise to everyday, this sock features blister protection, contoured padding, and light to moderate compression for support and fit. For the best fit, it is important to use the size