size large Thermo Soft Thermo fabric is breathable, sweat-wicking, and four-way stretch. Soft Breathable Sweat-wicking Four-way stretch Features Designed for: Run Versatile pocket: Chest pocket holds your passport or phone Thumbholes: Help keep your sleeves in place and hands warm Shine-bright : Reflective detail helps keep you on the radar in low light Mobility: Underarm gusset for greater mobility