$39.25
$62.8
DescriptionNext-Level Cooling You Can Wear Every DayThe UnderCool 3 PCM Cooling Vest offers effective body cooling in a sleek, lightweight design that fits comfortably under your clothes. Whether you’re navigating a hot summer day, performing outdoors, or managing heat-sensitive symptoms, this vest helps you stay cool, dry and confident.UnderCool uses phase change material (PCM) cooling packs that absorb and release body heat consistently for around 1–3 hours of cooling, depending on pack type (SlimCool or ExtendedCool). The bio-based PCM is biodegradable, non-toxic and designed to stay dry against your skin — no condensation, sweat build-up or cold wetness.Features Designed for Comfort & Everyday UseSlim, Lightweight & ConcealableUnderCool 3 is built to be worn under regular clothing without bulk. Its low-profile silhouette fits discreetly, letting you move, work or socialise comfortably in heat.Advanced PCM Cooling PacksSlimCool: approx. 1–2 hours of coolingExtendedCool: approx. 2–3 hours of coolingThese packs recharge quickly — 30–60 minutes in ice, fridge or freezer — and can be reused thousands of times with proper care.Comfortable Fit & Breathable FabricThe vest features 4-way stretch fabric, adjustable straps and a Velcro front for a secure, custom fit. Wicking materials help keep you dry by drawing moisture away from the body.Why UnderCool 3 Works for YouWhether you’re outdoors, indoors or on the move, controlled cooling around your core helps regulate body comfort in heat. The vest’s design keeps cooling packs close to the body while remaining flexible and light — without ice burns or cold wetness typical of traditional ice packs.This makes it suitable for:Everyday wear in warm climatesOutdoor work, events or activitiesHeat-sensitive conditions (e.g., warm weather intolerance)Fitness, travel or holiday comfortGarment Facts:4-way stretch, adjustable straps and velcro front for best fit and comfortWicking fabrics to keep you dry88% Nylon/12% spandexMachine washable, lie flat to dryCooling Pack Facts:ThermApparel PCM freezes at 70F (21C) so its safe for contact with the skinWorks great in dry and humid conditionsThermApparel bio-based PCM is non-toxic and biodegradableFast recharge times (30 min icewater, 45 min freezer, 60 min fridge)This package includes:1 UnderCool garment with choice of color, black or white3,4, or 6 cooling packs based on sizing. SlimCool or ExtendedCool.Free shipping option at checkout!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 – 162cmSizing Tips:Sizing is based on your natural waist, not your hips, pants, chest or cup size.Measure against your skinTake your measurements in front of a mirror to make sure it is level.UnderCool should fit your body like a glove to give you the best cooling.Cooling Pack Care and Storage Recommendations:When not in use, store Cooling Packs in the solid state, this means the fridge, freezer, or a room less than 70F/21CCooling packs left in their melted state for extended periods of time may reduce the lifespan of the cooling packs.When handled properly packs should last 2-3 years and can be refrozen thousands of times.To wash your cooling packs, use warm soapy water in the sink. Do not put them in the washer, dryer, or dishwasher.Please review our Return and Exchange Policy, Warranty Policy and User Guide.FAQ’s1. How does the UnderCool 3 cooling vest work?UnderCool 3 uses phase change material (PCM) cooling packs that absorb excess body heat and release it gradually, providing consistent cooling without ice, moisture or condensation.2. How long does the cooling last?Cooling duration depends on the pack type. SlimCool packs typically provide around 1–2 hours, while ExtendedCool packs can offer up to 3 hours of cooling.3. Can I wear the UnderCool 3 under normal clothing?Yes. The vest is slim, lightweight and designed to be worn discreetly under shirts, jackets or uniforms without adding bulk.4. Does the vest get wet or cause condensation?No. PCM cooling packs stay dry and do not create condensation, so you won’t experience the dampness common with ice-based cooling products.5. Is UnderCool 3 safe to wear against the skin?Yes. The cooling packs are designed to maintain a safe, comfortable temperature and will not cause ice burns or extreme cold sensations.6. How do I recharge the cooling packs?Cooling packs can be recharged in ice water, a refrigerator or a freezer. Recharge time typically ranges from 30 to 60 minutes, depending on the method used.7. Can I use the vest while walking or being active?Yes. UnderCool 3 is suitable for light to moderate activity such as walking, working outdoors, travelling or daily tasks. It’s designed to move with your body.8. Who is the UnderCool 3 cooling vest suitable for?It’s ideal for people who struggle with heat, work or exercise in warm conditions, or want extra comfort during hot weather. It’s also suitable for heat-sensitive individuals seeking non-invasive cooling support.9. Is the UnderCool 3 reusable?Yes. The PCM cooling packs are reusable and designed for long-term use when cared for properly.10. How do I choose the right size?Sizing is based on chest measurements. The adjustable straps and stretch fabric allow for a secure, comfortable fit across a range of body types.
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