What Are the Best Underwear for Running in Hot Weather?
When the temperature climbs and your workout heats up, one thing becomes crystal clear: your underwear choice matters. While technical running shoes and moisture-wicking outerwear tend to take the spotlight, it’s often what you wear underneath that makes or breaks your comfort level.
If you’re running in hot weather and find yourself dealing with chafing, sweat build-up, or discomfort, your underwear is probably to blame — and switching to breathable, natural fibres like bamboo or cotton could be the change your body thanks you for.
At British Boxers, we specialise in lightweight, breathable underwear made from bamboo jersey and pure cotton — ideal for both everyday wear and light exercise, including summer running, walking, or cross-training in warm weather.
What Should You Look for in Running Underwear?
Good underwear for running in hot weather needs to be breathable, moisture-wicking, supportive, and non-restrictive. The goal is to minimise friction, allow airflow, and prevent sweat from sitting against the skin — particularly in high-friction areas.
Most technical performance underwear on the market today is made from synthetic fibres like nylon, polyester, or elastane-rich blends. These can perform well in terms of moisture-wicking, but they don’t always suit people with sensitive skin, and can trap heat and bacteria when worn for long periods — especially if you’re not showering immediately after your run.
That’s where natural fibres like bamboo and cotton offer a cooler, more skin-friendly alternative.
Why Bamboo Underwear Is Ideal for Hot Weather Running
Bamboo fabric is one of the best-kept secrets in the underwear world — especially for runners and active people. Its natural moisture-wicking properties help draw sweat away from the skin, while its thermoregulating abilities work to keep your body temperature balanced, even in the heat.
Bamboo is also incredibly soft, meaning you’re far less likely to experience irritation or chafing on long runs. It’s hypoallergenic, antibacterial, and resists odour better than synthetic blends — all of which make it a great choice for running in high heat, especially if you’re layering over compression shorts or gym leggings.
At British Boxers, our bamboo boxers and women’s full briefs are cut with just the right amount of stretch, support, and softness to make them perfect for low- to mid-impact summer workouts or outdoor jogs.
Is Cotton a Good Choice for Running in the Heat?
Cotton often gets a bad rap for workouts — but that’s only because the wrong type of cotton can retain moisture. However, lightweight, breathable, premium cotton underwear (like ours at British Boxers) performs much better.
Our woven and jersey cotton underwear is light, airy, and naturally breathable. It’s perfect for shorter runs, everyday movement, and situations where you're likely to sweat but want to stay cool and comfortable.
While cotton may not be as fast-drying as bamboo, it’s still a great choice for those with skin sensitivities or anyone who prefers the crisp, classic feel of all-natural fabric next to their skin.
For men, our bamboo boxer briefs offer excellent summer support without tight compression. They’re ideal for hot days when you want lightweight coverage and softness without synthetic layers against the skin. Our classic cotton boxers also offer a looser fit, which some men prefer during low-impact running or long walks in the heat. For women, our bamboo full briefs, high-leg knickers, and women’s boxers provide breathable coverage, gentle stretch, and moisture control — helping reduce discomfort and sweat-related irritation, especially during hot weather runs or long-distance walks. If you're looking for underwear that moves with you, minimises friction, and helps you stay dry in sticky conditions, both bamboo and cotton from British Boxers are unbeatable.
What’s the Healthiest Fabric for Hot Weather Underwear?
Bamboo and cotton consistently top the list when it comes to the healthiest fabrics for summer underwear. Bamboo is naturally antibacterial and helps prevent the build-up of odour and bacteria, which makes it perfect for post-run freshness. Cotton is non-irritating, hypoallergenic, and especially helpful for people prone to yeast infections or skin flare-ups from synthetics. Unlike polyester or nylon underwear, which can trap heat and restrict airflow, both bamboo and cotton allow your skin to breathe, helping regulate temperature and reduce sweat retention. So if you're running in the heat and want to avoid the uncomfortable “sweaty underwear” feeling — breathable fabrics like these are your best friends.
Don’t Overlook Your Base Layer
Whether you're a seasoned runner or just heading out for a jog on a sunny day, the underwear you choose can make or break your comfort. While synthetic activewear certainly has its place, don’t underestimate the power of natural, breathable, skin-friendly underwear made from bamboo or cotton. With British Boxers’ collection of lightweight, moisture-wicking, and comfort-driven underwear for both men and women, you’ll experience better airflow, less chafing, and a cooler, fresher feel from start to finish.
Further Reading
The Comfiest Pants You’ll Ever Own? Let’s Talk Full Briefs — And Why Bamboo Might Just Be Better Than Cotton
Why Bamboo Briefs Could Be the Healthiest Choice for Men – At Any Age
