Our Paulo Alto tech button-ups are the perfect practice shirt for the saddle, tennis court, or golf course. Using an environmentally friendly Chitosante® treated knit body and signature patterned accents, this style gives the ultimate in sport tech; maximum mobility, comfort, high breathability, and cooling techniques. Plus added features like UPF 50, a unique mesh sleeve & venting with a button-up collar, these styles bring the heat in warm weather athleisure. Body: 100% Polyester. Collar & Lining: 100% Egyptian Cotton. Mesh: 80% Nylon / 20% Spandex. The model is 5'9"; 32" bust and 27" waist and is wearing a size S.