Provide warmth for years by taking advantage of stored latent heat in these reusable hand warmers. The phase-change material is food-Grade, Non-Toxic sodium acetate aqueous solution inside a 4mm Heavy Duty PVC barrier. Each hand warmer has been pressure tested and is guaranteed for one year. Note: The amount of heat generated by all 'clickable' reusable hand warmers is determined by the size. These are smaller to fit in gloves, and will last 15-20 minutes. This can be doubled by reheating them before use, to take advantage of sensible heat before clicking the activator (latent heat). To recharge, place in boiling water or rice cooker. Avoid direct contact of the hand warmers with the heating surface by using a steaming rack, parchment paper, or a cloth.
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