Story Performance-engineered tee for the pursuit of your personal best Ten Thousand redefines the training staple with the Interval Shirt, a technical powerhouse built to withstand the most punishing workouts in your rotation. Engineered with a high-stretch, lightweight fabric, this shirt provides uncompromised mobility whether you’re under a barbell or hitting the pavement for a long-distance haul. It is the ultimate piece of utility gear—clinically tested for durability and designed to stay cling-free, breathable, and distraction-free until the final rep. Features High-stretch performance fabric provides a full, unrestricted range of motion Advanced moisture-wicking and quick-drying properties keep you light and dry Permanent Odorblock™ treatment ensures freshness throughout high-output sessions Anti-chafe flatlock seams and bonded construction eliminate irritation and hotspots Lab-tested to resist 20,000+ abrasions, ensuring long-term resilience in high-wear areas Sizing The Interval T-Shirt fits true to size. Take your usual t-shirt size. Materials Body: 84% Polyester, 16% Spandex Weight: 144 GSM Treatments: 3M Easy Care, Permanent Odorblock™ About 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.