Story Lightweight and high-performance midlayer developed with members of the U.S. Special Operations Forces Your workout routine doesn't need to stop when the sun heats up or the mercury takes a dip. The secret sauce? A revolutionary Ripstop™ shell paired with Polartec Power Grid™ fabric, which, despite the fancy name, works overtime in both high heat and low temps. It'll regulate your core temp, fend off odor, and, thanks to its 4-way stretch, offer unrivaled mobility. This industry-leading over zip was designed with Tu Lam, a veteran with 23 years in the U.S. Army and 18 years in the Special Forces, to ensure performance in every session and in every condition. So say goodbye to the days of adjusting your 'fit mid-run or feeling restricted during your weight-lifting session. This midlayer champions the perfect balance between lightweight comfort and rugged durability. Features Polartec Power Grid™ main fabric for lightweight warmth Durable Ripstop™ shoulders and sleeves treated with water-repellant DWR finish for workouts in any weather Permanent silver ion anti-odor treatment Moisture-wicking, 4-way stretch fabric Low-profile card or cash pocket at left arm Breathable for comfort over long distances Materials Body: 92% polyester, 8% elastane Upper: 80% nylon, 20% spandex Imported Sizing Ten Thousand shirts have a regular fit that’s true to size, take your usual size in athletic shirts For the best personal fit, compare the measurements of one of your best-fitting shirts to the garment measurements below Garment Measurements S M L XL XXL Chest 39½ 42 44½ 47 49½ Body Length 27⅔ 28½ 29⅓ 30¼ 31 Sleeve Length 25 25½ 25¾ 26¼ 26⅔ All measurements in inches. How to Measure Garment Chest: measure on a shirt from side to side starting 1” under the armpit, multiply by 2 Body Length: measure on a shirt from the high shoulder to the bottom hem Sleeve Length: measured on a shirt from the center back to the cuff opening Care Machine washable About Ten Thousand In the noisy world of fitness apparel, Ten Thousand is an NYC-based brand hellbent on bucking trends and building workout clothes that are truly timeless. By disregarding their industry’s gimmicks and garish neon, they cut to the core of what makes great activewear great—clean designs, the highest performance materials, and fits that give you a full range of motion. Their whole lineup is designed from the ground up to match the hardscrabble, everyday training schedule of the serious amateur athlete. Built from sturdy Italian fabrics, everything here will last for the long haul. And a silver ion treatment assures it’ll stay permanently odor-free, even if you had to wear them for multiple workouts in a row.