Developed by a certified pedorthist, these are the insoles that instantly mold to your feet for perfect, customized support. Simply heat the insoles in a microwave to soften the gel, place them inside your footwear, and stand on them for two minutes. Unlike lesser insoles that require weeks to form to your foot's unique shape, these contour to your arch and heel immediately, providing optimal foot support that can help reduce foot, knee, and back pain. The insole's soft upper cradle cushions the foot for enhanced comfort and the firm lower cradle provides a foundation for improved balance and posture. Shock-absorbing urethane inserts under the heel and forefoot prevent fatigue caused by heel strikes and striding, respectively. The patented top layer naturally wicks away moisture and reduces friction to prevent blisters. Sizes S (Men's 4-5 ; Women's 5-6).