allbirds Women's Natural Run Short Sleeve Tee Natural Black NWT Break a sweat, not the planet with this ultra-light, breathable mesh tee. Made with a mix of sustainable materials (like eucalyptus tree fiber and merino wool) it wicks moisture, dries quickly and keeps you cool for every squat, stretch, and stride. Product Features Use: Running, training, walking Easy, slim fit that hits at hips Ultra-light, breathable mesh fabric Material: 45% Merino Wool, 36% Recycled Polyester, 19% Tencel™ Lyocell Measurements for SMALL: Length:23" Armpit to armpit (measured laid flat):17"