Winter Cap P1

Assos Winter Cap P1

The Winter Cap P1 from Assos is a highly insulating under-helmet cap for cold rides in Switzerland. The all-around seamless Circular Seamless material provides the foundation for a dry microclimate and sits softly on the head. Over the forehead and ears, the two-layer twinDeck construction provides additional ear and forehead protection without compromising breathability. Assos has revised the fit at the crown so the cap sits reliably even with longer hair and doesn't bulk up under the helmet. Also new is a slightly larger side coverage that better shields the ears. The material blend of 84% polypropylene, 8% polyamide and 8% elastane combines thermal performance with efficient moisture management.

• All-around Circular Seamless knit for soft, pressure-free fit.
• Zones with twinDeck double-layer at forehead and ears for increased insulation.
• Revised crown for better fit with long hair.
• Updated side coverage protects ears even better.
• Breathable insulation promotes a dry microclimate on long winter rides.
• Elastic, helmet-compatible under-cap with low volume.
• Material: 84% polypropylene / 8% polyamide / 8% elastane.

Technical Details and Features

The Circular Seamless construction eliminates disruptive seams, reducing pressure points under the helmet and noticeably increasing wearing comfort. In the sensitive areas over the forehead and ears, Assos uses the two-layer twinDeck construction that retains heat while actively transporting moisture outward. This creates a pleasantly dry microclimate that performs equally well during intense climbs and long, cool base rides. The breathable fibres allow excess heat to escape, while the high polypropylene content shortens drying time. Additionally, the crown has been constructed more flexibly so the cap sits cleanly even with longer hair and functions reliably under various helmets. The latest generation has extended side coverage that additionally protects the ears during biting crosswinds.

Applications and Benefits

This helmet cap is recommended for daily commuting in the greater Zurich area, for winter road bike loops through the Mittelland, and for gravel and MTB trails when the wind cuts sharply around the ears. Thanks to breathability, the head stays pleasantly dry even during longer climbs or intervals, keeping thermoregulation stable. The seamless, elastic construction adapts to different head shapes and barely bulks up under the helmet, so ventilation openings can continue to work effectively. On long distances, the combination of insulation and moisture transport prevents cooling during descents. Those looking to optimise their winter layering strategy can combine the cap with matching Assos winter accessories like gloves or face protection, tailored to the respective intensity. Overall, the Winter Cap P1 offers a balanced ratio of heat retention, comfort and moisture management for typical Swiss winter conditions.

Fit and Combination Tips

The cap is designed as an under-helmet cap and can be worn with most road, gravel and MTB helmets without problems. Thanks to the adaptable crown, it sits securely even with long hair without building pressure or slipping. For particularly cold days, it can be supplemented with a Winter Face Mask P1 or a Neck Warmer to close gaps between layers. In moderate cold, it works solo or together with a thin headband layer, depending on personal temperature perception. The side coverage completely covers the ears, while the open top allows enough air exchange through the helmet channels. This maintains the balance between protection and ventilation, whether on the commute to work or weekend rides.