The Rapid Relief Instant Warm Packs with patented Insta Gel technology deliver soothing warmth directly to the skin for therapeutic healing. Patented gel technology turns from liquid to a contouring gel when activated, allowing for the product to contour to each affected body part. Tested to retain heat much longer compared to other traditional instant warm packs. Features: Temperature: Delivers approximately 44°C/111°F of warm therapy when activated at room temperature. Gentle Touch technology, which means this product can be applied directly to the skin. FTP (fold-to-pop) technology, allowing the user to activate the warm pack simply by folding it in half. Direct-to-skin application with Gentle Touch technology. Tri-lingual packaging (English, Spanish and French). Application: INSTANT WARM THERAPY RELIEF: Arthritis pain, Relax sore muscles, Improve the flexibility of tendons and ligaments.