Warm up fast. Move more freely. The Nike x Hyperice Hyperboot uses heat and dynamic air compression to help prepare your feet and ankles for movement. Advanced Heating and Massage:Designed to help you feel ready before activity, the Hyperboot combines Hyperice heat and dynamic air compression technology to support ankle mobility, flexibility, and movement preparation. Heat helps loosen and warm muscles in the feet and ankles, while compression provides a rhythmic massage sensation to help you move more freely before training. Lightweight and wearable, the Hyperboot is built to help you warm up wherever you go. Relaxation on the Move:Dual-air Normatec bladders bonded to heating elements deliver consistent heat throughout the feet, Achillies, and ankles to help warm muscles and prepare your body for movement. Quick Adjustments:Buttons on the shoe or BluetoothA(R) connection to the Hyperice App let you customize heat and Normatec dynamic air compression levels on the go. [] Product Details:Nike return policy is 60 days. One year warranty is through Hyperice only. Heat temperatures:Level 1 = 111AdegF (44AdegC)/Level 2 = 118AdegF (48AdegC)/Level 3 = 125AdegF (52AdegC). Normatec compression levels:Level 1 = 50 mmHg/Level 2 = 130 mmHg/Level 3 = 210 mmHg. Battery life:1a "1.5 hours on max heat/compression. USB-C charger. TSA friendly. FSA/HSA eligible. Spot clean. Imported. Style: 65000; Color: Black; Size: S; Gender: Unisex; Age Group: Adult | Nike x Hyperice HyperBoots Shoes in Black, Size: Small | 65000-001