SKIMS totally talks the talk. These panties are comfortable, breathable, seamless, and they don’t roll or bunch. The stretchy fabric means they move with you without digging in. Plus, they come in nine different neutral tones to match your skin and have plus sizes. There are two main considerations when shopping for thermal underwear. It’s important that this innermost layer fits like a second skin and that it’s made from materials that won’t irritate. This may sound daunting, but it’s easy to find thermal underwear that meets both your needs and your budget. Below we explore the key considerations when purchasing good-quality thermal underwear, while also listing the best thermal underwear available to buy now. Specialist brand Become is selling cooling underwear designed for menopausal women with hot flushes – and we can't believe we've only just found out it exists! Customers love this pair because they're flattering and stretchy, so they're totes worth the money. Consider them the perfect complement to your go-to high-waisted leggings (thanks Kim).

Silk is a natural fibre that’s naturally breathable, too, which means you can also wear these leggings in the summer months to keep you cool. Thermals made of silk are basically the only thermal option that can be worn year round.

Evidence shows that too much heat exposure regularly can damage your sperm. Exactly how often and how much remains unknown. But, if you have fertility concerns and sit in a hot tub every day, you might want to lessen the frequency. One reviewer wrote: “These fit true to size and provide some solid support, while also accommodating movement! No snuggies, no over-stretching or bagginess, either! Was able to run 9 miles in them comfortably, and stayed cool!” Too much heat stress on the testicle can impact sperm production, possibly harming fertility. It can cause: STUD BRIEFS keeps your balls cool & Supported Thermal imaging shows Stud Briefs is on average 1.8°C (3.3°F)cooler. ✓ Cooler balls are bigger & healthier But all of the briefs we looked at meet the minimum in all these things, so you can’t go wrong with any of them!

These microfiber boyshorts are made from a super soft blend of polyester and spandex that will keep you cool no matter how warm it is outside. They have a breathable cotton liner and a comfortable, no-pinch waistband that disappears under most clothing. Fans love the full coverage design and comfort. There’s no doubt that these bottoms are one of the pricier options on this list, but in our opinion it’s well worth the extra cost. It works as intended, and with proper care will last an incredibly long time. The men’s bottoms here include a merino-covered elastic waistband and a standard fly design. Overall, Smartwool has some of the most comfortable and warm thermal underwear available. Whether you like to run outdoors or on the tread, these underwear stay in place all day without accumulating sweat. I like to say they're my invisible workout buddy.Short-Legged Boxer Briefs: Air flow is your best friend when it comes to keeping your bits dry, and this extra breathable boxer brief ensures moisture doesn’t have time to accumulate. Made of a 95/5 modal/spandex mix, this pair is silky smooth, comfy as cotton, and the honeycomb mesh design makes them super breathable. The pouch is reinforced with an extra fabric layer to fully support everything, and the hips are made to contour to your body for a tight fit so they don’t move too much. This thermal top is a lightweight layer to keep you warm and cosy on particularly chilly nights. This long-sleeved layer has a slim fit, but stretch means it’s never uncomfortable. Made from a combination of acrylic, viscose and elastane, it’s brushed on the inside to give an ultra-soft feel against the skin. One reviewer wrote: “Great moisture control. These are the softest and most comfortable boxers I've ever had.” Yes, there are actual “testicle coolers,” products that claim they cool your testicles to improve fertility. Underwear comes in a variety of fits and styles that provide differing levels of coverage. When you’re aiming to keep your bits cool & dry, usually the less skin that is covered the better the breathability. However, you can’t go commando so you’ll have to choose a fit that balances comfort & breathability.