Incredibly effective at relieving the pain of plantar faciitis, chronic arch & heel pain, & swelling in the foot. Compression Zone Technology in this amazing foot sleeve provides medical grade support for the foot structure & the Achilles tendon, graduated compression to improve circulation & reduce swelling, all in an ultra-comfortable moisture-wicking foot sleeve you can wear under your normal socks & shoes. FS6 is perfect to wear overnight or throughout the day to relieve heel pain & reduce tired and aching feet. Sold as a pair.