allbirds Men's Natural Run Mid Layer

Warm up your cold-weather runs with a layer of super-soft merino wool designed to keep you warm and comfy mile after mile.

• Half zip closure with a storm flap for extra neck warmth
• Thumb holes keep sleeves in place on chilly days
• Merino wool blend keeps heat in and wicks moisture out
• Enough stretch for full range of motion
• Warm and lightweight for layering