Shires H20 Cool Hydro Therapy BootsARMA cool hydro therapy boots provide an efficient alternative to cold water therapy. Micro crystals turn to a cooling gel when soaked in water. The crystals swell into the quilted fabric spaces to form a soft gel pad that hugs all parts of the leg when the boot is fitted. The cold compress reduces inflammation, swelling and bruising, cools tendons after exercise and treats soft tissue injuries. Mess free and reusable.