The OTSO short-sleeve technical shirt combines the best design and technologies to create a super lightweight, versatile, and comfortable garment with a unique style. Defy the Heat. Ultra-Breathable fabric maximizes ventilation and keeps the body always dry. Designed so that your performance doesn't drop even on the most humid and hot days. Move freely. Super lightweight and flexible fabric, with vertical and horizontal elasticity. Offers the greatest freedom of movement so you can move faster and more agilely. No Chafing. Made with the softest fabric. Provides a pleasant contact with the skin and prevents chafing on nipples or armpits.