Assos Summer Arm UV Protector P1

Cyclists accumulate more UV exposure than almost any other outdoor activity, and most of it lands on the arms. The Assos Summer Arm UV Protector P1 is Assos's answer to that problem — a purpose-built summer sleeve that delivers permanent UPF 50+ protection without the weight, heat retention, or bulk that makes most sun protection feel like a compromise on a hot ride.

The construction is built around a fabric blend of 89% polyamide, 8% polyester, and 3% elastane — chosen for its combination of UV-blocking density, moisture management, and stretch. The result is a low-volume sleeve that conforms closely to the arm rather than sitting loosely, which keeps it in place at speed and eliminates the bunching that plagues lighter arm warmers. Assos describes the fit as second-skin, and the fabric's elastane content backs that up. The textile is actively cooling rather than merely breathable — designed to work with airflow rather than trap heat — which makes the sleeve viable in conditions where a heavier arm warmer would force you to stop and remove it.

Packability is a genuine feature here. When conditions change or the ride heats up beyond what you want, the sleeves compress small enough to drop into a jersey pocket without taking up meaningful space. That flexibility makes the UV Protector P1 worth carrying on any summer ride with variable cloud cover, not just the days when you know you'll need it from the start. At $45, it's one of the more practical investments in the category.

Specs at a Glance

• UV protection: UPF 50+
• Fabric: 89% polyamide, 8% polyester, 3% elastane
• Construction: Ultralight, low-volume, second-skin fit
• Ventilation: Actively cooling textile
• Packability: Compresses to fit in a jersey pocket
• Use: Road, gravel, trail, triathlon
• Color: White Series
• Sizes: 0 (XS–S), I (S–M–L), II (XL–XLG–TIR)

Design Benefits

1. Permanent UPF 50+ protection — The UV-blocking properties are built into the fabric construction, not a topical treatment, so they don't wash out or degrade over time.
2. Actively cooling rather than insulating — The textile is designed to work with airflow to manage heat, making it usable in summer conditions where most arm warmers would be left at home.
3. Second-skin fit stays in place — The low-volume, high-elastane construction keeps the sleeve seated on the arm without slipping or bunching during the ride.
4. Pocket-packable — Compresses small enough to carry in a jersey pocket, so you can pull them on or off mid-ride without planning around the weather.