The Sonic Ultra Tee is a responsive, lightweight tee for mountain runners pushing performance. Slim-fitting and adaptable with built-in stretch, it’s ideal for running on sunny mountain days or tackling challenging inclines.Highly responsive to your output, it’s cleverly designed to regulate your temperature. Built with ultralight Motiv™ Aero fabric, the Sonic Ultra Tee is fast-drying, quick-wicking and highly breathable. With its subtle mesh structure, the fabric wicks moisture away from the skin, keeping you dry on intense climbs. Laser cut vent holes in high heat areas dump heat quickly and keep the air flowing. Ideal on its own for running in the heat, or for layering over as you climb to higher altitudes and exposed terrain.Details Fit: Slim Centre back length: (Size S): 64.5cm / 25.4inch Weight: 62g/2.2oz (Size 10) Motiv™ Aero single jersey fabric with subtle mesh structure (85gsm) with odour control treatment Lightweight fast wicking fabric with bulk yarn technology Microactive seams are strong and soft inside for comfort Set in sleeves Lazer cut vent holes in back of the neck and underarm panels Seam free outer sleeve edge eliminates chafing over long distances Split hem detailing with reflective bar tack Reflective branding Sweat mapped design 100% polyester Centre back length (Size 10): 64.5cm / 25.4inch