BUILT TO ENDURE AND LAST FOREVER The Rucking Shirt is the first piece of apparel we built from the ground up, in the USA, and have been building since 2016. The legacy of performance here - is strong. Built for rucking and training, and classy so you can wear it all day, anywhere. That&';s the kind of versatility we believe in. EnduraKnit fabric is an indestructible and lightweight performance fabric. It stretches with you, moves with you, and holds its shape over time. It&';s comfortable against the skin and breathable enough for movement, and durable enough to withstand long-term wear under load without breaking down or pilling. VERSATILE. Built in the USA to last forever.