Has a semi-rigid strap that pulls the toes upward and the foot into a slight dorsiflexion position * This gently stretches the plantar fascia so it may heal * The combination of the thermal properties that help reduce inflammation and the stretching of the plantar fascia while sleeping may aid in the treatment of Plantar Fasciitis  Non-slip Safety SoleTM rubber grip bottom helps prevent slipping

Sizing Guide by U. S. Shoe Size:

XS for Men's 3-5, Women's 4-6;

Small for Men's 5 1/2-7, Women's 6 1/2-9;

Medium for Men's 7 1/2-10, Women's 9 1/2-11;

Large for Men's 10 1/2-12, Women's 11 1/2-13; X

L for Men's 12 1/2-14, Women's 13 1/2-15