Defeat Old Man Winter with Underwarmer!

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.

Item Specifications and Features:

• Hotwarmer UW423
• Size Large
• Air Activated
• 8 Heating Elements
• Single Use