UnderCool 3
FREE SHIPPING & 60 DAY NO HASSLE RETURNS
The UnderCool 3 is a lightweight, concealable cooling vest designed to keep you cool and comfortable. Worn under clothing, it includes advanced PCM cooling packs that provide hours of dry, consistent cooling without condensation. Perfect for work, play, or travel. UnderCool 3 fits snugly for maximum comfort and enhanced mobility.
- DO MORE OF WHAT YOU LOVE: 1-3 hours of cooling time for your favorite activities. (1-2 hours with SlimCool, 2-3 hours with ExtendedCool)
- KEEP COOL NO MATTER WHAT: Our PCM cooling packs work in humid & dry heat.
- EASY TO USE: Recharge your cooling packs in the fridge, freezer, or ice water in 20-60 minutes.
- COMFORTABLE FOR ALL BODY SHAPES: 4 way stretch fabrics & lightweight, articulated cooling packs provide a flexible, secure fit.
- SAY GOODBYE TO UGLY, BULKY VESTS: Our sleek design ensures discretion under clothes.
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STAY COOL & DRY: Don't worry about condensation or soaking, like Ice or Evaporative Vests.
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SIZE: XXS
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SIZE: S/M/L
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SIZE: XXL
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Please review our sizing chart below to ensure the best fit for your UnderCool
| Size | Natural Waist (in) | Natural Waist (cm) |
| XXS | 18" - 24" | 46cm - 61cm |
| S | 24" - 31" | 61cm - 78cm |
| M | 31" - 40" | 78cm - 101cm |
| L | 40" - 51" | 101cm - 129cm |
| XXL | 51" - 64" | 129cm - 162cm |
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Sizing Tips:
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Reuse 1000’s of Times
Cooling Pack Care:
Washing Instructions:
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Non-Toxic Bio-Based Phase Change Material (PCM) |
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Freezes at 70F (21C) so its safe against the skin. Unlike Ice. |
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Works in humid & dry conditions |
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Cooling lasts 1-3 hours depending on cooling pack type & environmental conditions |
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Won’t condensate so you will stay dry |
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Recharges in 15-60 minutes |
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Can be used 1000’s of times for around 3 years |
What clients say
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NOW I CAN enjoy all that Walt Disney World has to offer without worrying about the walking or the weather!
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My UnderCool vest has allowed me to golf in warmer weather that would normally be too hot for me to play due to my MS.
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"MS is such a tiring disease. I was a very physical person, I was a physical educator, I was a coach, outdoor person and with climate change, Michigan has become very warm. I couldn't go outside. I couldn't last, I would go outside for 10 - 20 minutes doing something and I would be totally exhausted. The ThermApparel Cooling Vest made a world of difference. A huge world of difference. It gave me my life back
Why We're Better
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Evaporative Cooling
- Doesn't work in humidity
- Cools your skin, NOT your core directly
- Lightweight & Flexible
- Must be wet
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Our PCM Cooling System
- Works in any climate
- Cools your core body temp
- Lightweight & flexible
- Dry conformal cooling
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Gel & Ice Cooling
- Works in any climate
- Too cold for direct skin contact
- Heavy & rigid
- Wet from condensation