• Technical Fleece Delivers Exceptional Warmth for Its Weight
• Hollow-Core Fibers Trap Warmth while Preserving Breathability
• Smooth Outer Face Improves Durability and Slides under a Shell
• Phasic™ AR II Underarm Panels Add Stretch and Moisture Control
• Low-Weight Design Supports Year-Round Layering
• Deep Half-Zip Front Speeds Venting and Simplifies Dressing
• Articulated Patterning Encourages Unrestricted Movement
• Soft Fabric Feels Comfortable Against the Skin
• Polygiene® Odor-Control Treatment Extends Freshness
• Roomier Cut Adds Comfort and Layering Range
• Supports Climbing, Hiking, Skiing, and Other High-Output Mountain Pursuits

Steep skin tracks and fast approaches create heat long before the summit arrives. Hollow-core fleece and stretch underarm panels allow the Men's Delta 1/2 Zip Midlayer to hold useful warmth while releasing moisture during high-output movement. Open the deep zipper for quick cooling, then close it when wind returns or the pace settles. Arc'teryx shaped this lightweight technical fleece for skiing, climbing, hiking, and efficient four-season layering systems.