MATTR (Materials, Technology & Research) is the performance fabric designed for the highest level of comfort no matter the climate condition. Featuring technical moisture-wicking, fast-drying fabric, with breathable, four-way stretch and a lightweight feel, this material will give you everything needed to go low. Fit & Design: Regular fit Short sleeve Sewn-in collar stay 3-button placket Breathable and lightweight MATTR performance fabric 4-way stretch Technology: Moisture wicking Fast drying UPF DRYCELL Additional Details: Made in part with recycled materials