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Specifications

Collection Summer 2026
Color specification Black
Condition New model
Gender Men
Season Autumn, Spring
View all specifications

Description

The Assos Endurance Thermobooster P1 is the versatile midlayer that provides comfort and warmth all year round.

Thanks to its RX fabric, it combines soft insulation with breathability and low volume for easy layering.

Wear it over a jersey, under a rain jacket, or even under a winter coat for maximum protection.

With its streamlined design and raw-cut finish, you'll experience ultimate comfort without excess seams.

The Assos Endurance Thermobooster P1 is designed as the ultimate midweight layer that adapts effortlessly to any season and any ride. With a simple but thoughtful design—one fabric, one zipper, total versatility—this layer offers year-round protection and comfort.

Whether you need extra warmth during chilly spring rides, descending mountains in the summer, or protection under a rain or winter jacket, the Thermobooster P1 adapts to your conditions. In mild cold, wear it over your jersey; on wet rides, it acts as an insulating layer under your rain jacket; and in extreme winter conditions, it provides optimal thermoregulation under your winter jacket.

At the heart of this design is RX fabric, an extremely versatile Roubaix-like material. It offers soft, midweight insulation combined with high elasticity and a slim fit, ideal for effective and comfortable layering without extra bulk.

The regularFit with body-contoured shaping reduces the number of seams, eliminating friction and increasing freedom of movement. The raw-cut finish also creates a sleek, aerodynamic look without thick hems, perfect for both performance and comfort.

This makes the Thermobooster P1 an essential garment for cyclists who want to be prepared for all seasons and value flexibility, comfort, and performance.

Key features:
-Midweight insulation, suitable for year-round use
-RX fabric: soft, breathable, elastic and low volume
-Versatile to wear: over a jersey, under a rain jacket or winter jacket
-regularFit with body-contoured shaping for comfort and freedom of movement
-Raw-cut finish: aerodynamic, without seams or hems
-Designed for total versatility and adaptable to all weather conditions

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Do you have a question about this product, sizing, the material, or anything else? Our specialists are happy to help.

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Fitting in Volkel, with personal advice

Would you like to see or try on this product first? Then visit our store in Volkel (Brabantstraat 16, 5408 PS, North Brabant), The Netherlands.

Tip: please check in advance (by phone +31(0)413-256800, or via [email protected]) whether this product is in stock in our store.

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Questions about delivery, delivery times or returns? We’ve listed everything clearly for you.

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Tip: check in advance whether this product will also be available during the wetsuit test days.

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Specifications

Collection Summer 2026
Color specification Black
Condition New model
Gender Men
Season Autumn, Spring
Size 2XL
Supplier item number 11.24.417.18/2XL
Warranty 2 years

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