rulu™ Stretchy, naturally breathable Rulu™ fabric is sweat-wicking and buttery soft four-way stretch sweat-wicking buttery-soft handfeel naturally breathable features Designed for: Run, train Thumbholes: Help keep your sleeves in place and hands warm Reflective details: Intentionally placed for visibility in low light Zipper pocket: Store your stuff in the secure zippered pocket Slim fit: Makes for easy layering