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The UnderWarmer® is a single-use, compression fitted base-layer shirt. 8 HEAT PACKS are built-in and will activate within minutes of removing from its packaging. When ready to use, simply remove The UnderWarmer® from its packaging. Upon opening, heat activation begins and will take approximately 30 minutes to reach its maximum temperature of over 100f/38c.

Save on The UnderWarmer® Heated Compression Shirt- Free Ground Shipping On Orders Over $25 with a UnderWarmer coupon

Checkmate is a savings app with over one million users that have saved $$$ on brands like UnderWarmer.

The Checkmate extension automatically applies UnderWarmer discount codes, UnderWarmer coupons and more to give you discounts on products like The UnderWarmer® Heated Compression Shirt- Free Ground Shipping On Orders Over $25.