Assos Summer NS Skin Layer P1 — Men's Sleeveless Base Layer

The Assos Summer NS Skin Layer P1 is the base layer that disappears once you're on the bike — 15% lighter than the previous generation, more elastic, and built around a single job: keeping you cool and dry when the temperature climbs above 21°C.

Why riders choose it

Open-structure mesh that actually breathes. Most "summer" base layers still trap heat once you're 30 minutes into a climb. The new Circular Seamless mesh has a more open weave that moves hot, damp air off your skin instead of holding it against your chest — so you stay cooler under a closed-front jersey on long, hot days.

Sleeveless, raw-cut armholes. Sleeves under a race-fit jersey bunch, roll, and create pressure points on the shoulders. The sleeveless cut and bonded raw edges sit completely flush, eliminating layering bulk so your jersey sleeves stay where they should.

Second-skin elastic fit. A loose base layer flaps, slides, and stops wicking the moment you start sweating. The new fabric blend wraps the torso without squeezing, so moisture moves through the fabric instead of pooling — meaning no cold, clammy feeling on fast descents.

Permanent odor control. Carbon-fiber yarns inhibit bacteria growth at the fibre level, so the garment keeps performing on back-to-back rides and long trips without going stale after a few washes.

Deep collar shape. Mirrors the collar profile of both regularFit endurance jerseys and low-collar racingFit jerseys, so nothing pokes above the neckline regardless of which jersey you pair it with.

Ideal for

• Hot-weather road and gravel rides above 21°C
• Long climbing days where breathability matters more than insulation
• Race days and fast group rides under second-skin jerseys
• Indoor training when sweat management is the priority

Specifications

• Temperature range: +21°C and warmer
• Riding conditions: Warm / hot weather
• Fit: Regular — second-skin, body-wrapping
• Sleeves: Sleeveless, raw-cut armholes
• Composition: 68% Polypropylene, 29% Polyamide, 3% Carbon Fiber
• Breathability: 5/5 · Quick drying: 4/5 · Packability: 5/5 · Insulation: 1/5
• Color: Grey Series
• SKU: P11.40.466.1O

Pairs naturally with Assos racingFit and regularFit summer jerseys, summer bib shorts, and lightweight summer socks.