Patagonia Men's R1 Air Zip-Neck

1. Material: The M R1 Air Zip Neck typically utilizes a lightweight, breathable fabric that wicks moisture away from the body. This helps keep you dry and comfortable during intense activities.

2. Design: It features a zip neck closure, allowing for adjustable ventilation. You can unzip it for extra breathability or zip it up for added warmth.

3. Fit: The base layer is designed with a snug, athletic fit to ensure it sits close to the skin without restricting movement. This helps with layering and enhances the overall thermal efficiency.

4. Functionality: It often includes technical details such as flatlock seams to minimize chafing and strategically placed mesh panels for improved ventilation.

5. Versatility: This piece is typically designed to be worn as a standalone item in milder conditions or as part of a layering system in colder weather.

Overall, the M R1 Air Zip Neck is a versatile and functional garment ideal for a range of outdoor activities, from hiking to skiing.