Härkila Heat L/S T-Shirt is a long-sleeve base layer with sewn-in heating membranes. Power comes from a separately sold power bank, and the shirt suits driven hunts, high seat hunting and outdoor use in cold weather.
The heating membranes are located on the lower chest and the upper and lower back. The temperature is set to 35, 43 or 50 degrees Celsius with the button on the chest. The membranes are flexible, so the shirt can be folded and packed, and it can be machine washed.
A pocket on the right side holds a long, fabric-covered cord with a waterproof USB plug, so the power bank can be kept in a trouser pocket, for example. With a 10,000 mAh power bank the shirt runs at the highest 50 degree setting for about 7 hours at an outdoor temperature of 0 degrees. The membranes go into standby once the set temperature is reached and switch back on when it drops 1-2 degrees, so the heating regulates itself according to your activity level.
The fabric is 80% nylon and 20% elastane: quick-drying, stretchy and hardwearing. The cut is modern and fairly close-fitting, the sleeves have thumbholes and a dry bag is included.
An adjustable heated base layer for long, still hours in the cold.
Note: Power bank sold separately.
Product text updated 26.09.2026.
