From the manufacturer

On fresh mornings when a tee won’t cut it, the Sonic Hoody is the only layer you need. With a close-fitting wrap-style hood and excellent articulation, this lightweight, technical baselayer adapts to a range of activities where you need a little more protection but it’s too warm for a midlayer. The highly breathable Dryflo™ Air fabric responds to your output, effectively wicking away sweat and ensuring you stay dry and comfortable on your fast hikes, mountain runs, and demanding ascents.

Features

• Lightweight, wicking Dryflo™ Air fabric offers rapid drying and maximum airflow to regulate your temperature. 
• Stays fresh over multiple days thanks to odor control treatment. 
• When the breeze picks up, the snug wrap-style hood provides a boost warmth. 
• The strong microactive seams are comfortable next to your skin. 
• Keep sleeves in place with the hidden stretch thumb loops. 
• Underarm gussets offer great arm lift when you're reaching for the next hold on climbs and scrambles. 

Specifications

• Fit: Regular
• Weight: 107g (Size 10)
• Center Back Length: 26.4" (Size 10)
• Main Fabric: Dryflo™ Air single jersey fabric (85gsm) with odour control treatment