What does 37.5º mean to you? If you’re in America and measure temperature in the Imperial system, you would probably say it’s an early winter chill. In the more popular Celsius, it’s the optimal core temperature of the human body, and the temperature our newest pant promises to help you maintain, regardless of the temperature outside.

You’ll never feel hot or cold again.”

Our Core Temp line of pants and shorts features 37.5® Technology, which has been limited to your favorite gym styles, until now. We’re excited to welcome this performance fabric into your 9-5-9 wardrobe, and we think you will be, too. To help explain the hype, we asked Jane Ibarra, the brains behind our innovative fabric development department, to break down the benefits of our new Core Temp Pant.

This chino has a performance element, but still feels true to the man, the brand and the customer.”

Jane describes the Core Temp Pant as your favorite pant but with invisible technology: It has the stretch that you’ve come to love in nearly all of our pants, but it also has quick-dry and wrinkle-resistant properties, as well as this heat-regulating technology. Jane reveals that the material was originally made for mountain climbing and severe weather temperatures, but we’ve been able to give it the same look and feel as any other trouser you’d wear to work or on a night out.

What excites Jane most about our Core Temp Pant isn’t it’s many features, but rather that the features stem from the fiber of its being. Oftentimes, performance qualities are added through a finish, which leads to several negative side effects: the finish can wash off over time which means that the product will lose its benefit—but even worse—the washed-off finish can harm the environment. “One of the coolest things about this pant, is that we’ve been able to embed that temperature-regulating technology directly in the fiber, which means it won’t wear off over time,” Jane tells us. “Even better, it’s not harmful to the environment.”

The idea is to stay true to who we are—having a natural fiber as our chief value content…but blending it with something that gives it the elevation with performance.”

The 37.5® Technology is a “patented active particle that comes from volcanic sand and activated carbon from coconut shells—the combination of these two particles traps moisture and allows the person to be able to have the optimal core temperature.” The particle is spun into polyester, which is then woven with any other fiber to create a blend. “We’re using the nature-given, temperature-regulating abilities of the coconut shells and active volcanic sand, and mixing in natural fibers like cotton from there,” Jane says.­­­ This means you get the comfortable feel and familiar look of cotton with sustainable performance technology.

The idea of it coming from a fruit and a volcano is kind of amazing.”

Whether you’re headed to the office or on a hike, our Core Temp Pant can be paired with all your favorites. “It’s an elevated casual look. People aren’t dressing as conservative as they used to,” Jane explains. She suggests pairing it with a blazer and our SUPIMA® Tech-Stretch Shirt for work or one of our sweaters with COOLMAX® fibers on the weekend. It’s just like your favorite chino, but even better.

Obsessed yet? Find your perfect Core Temp fit in our Tailored Performance Shop. We don’t plan on stopping there, so look forward to temperature-regulating sweaters and more, coming soon.