The Night Splint provides passive stretch for the Achilles tendon progressively helping alleviate the pain by increasing range of motion. It only needs to be worn for 15 minutes at a time and does not have to be worn at night. Flexion straps provide a gentle stretching of the plantar fascia and Achilles tendon Adjusts from 10-90 degrees dorsi-flexion for the optimum pain-relieving stretch Cool foam liner, padded calf and ankle straps for additional comfort to keep cool and dry Medium fits men's size 7.5-9, women's size 8-9.5, please measure foot for best fit Product Dimensions ‏ : ‎ 14.5 x 11 x 5 inches; 1.1 Pounds Most importantly, we also give you the information you would get at a doctor's office about how and when to use the Night Splint to get the best results.