For the casually athletic, or just the plain casual. This quarter zip is lightweight, stretchy, and insulated to keep you warm. Bonus: it packs wayyy down into itself, so it's perfect for travel. Nylon and Spandex team up to create a lightweight, stretchy, and water-repellent. It's lightly insulated with 30 GSM (grams per square meter) down that's been RDS certified. Heyo! Alex is 6’1”, is wearing a Medium, and starts every day with yoga and a pitaya bowl (you can Google it...we had to).