ENDURANCE THERMOBOOSTER BIB TIGHTS S11

Assos ENDURANCE THERMOBOOSTER BIB TIGHTS S11

The ENDURANCE THERMOBOOSTER BIB TIGHTS S11 are versatile winter bib tights designed to be worn over your summer bib shorts, for cross-training, or as an additional insulation layer in very harsh weather. This model comes without a chamois, making it particularly well-suited for layering concepts while avoiding unnecessary bulk. The heart of the design is the RX EVO Plus material, which offers the strongest thermal performance within the RX EVO family and wraps large muscle groups tightly thanks to asymmetric stretch. The tights are constructed in regularFit (unisex), available in blackSeries colour, and cover eight sizes from 2XS to 3XL.

• No chamois for maximum layering freedom over your summer bibs
• RX EVO Plus: highest insulation performance in the RX EVO family, odour-resistant and abrasion-resistant
• regularFit (unisex) with close-to-body fit and minimal bulk
• zeroPressure Waist for pressure-free hold at the waistband
• X-Frame brace system for stabilising the torso area
• Reflective leg cuffs for better visibility in low light
• Raw-edge finishes at waist and ankles with light compression
• Material composition: 76% Polyamide / 24% Elastane
• Compatible for layering with ASSOS R and TACTICA series
• Also suitable for skating, running or warming up before interval training

Technical Details and Features

The RX EVO Plus textile provides strong thermal performance with minimal bulk through its dense yet elastic structure, efficiently retaining body heat in the microclimate. It's odour-resistant, resists abrasion, and stays deep black when stretched rather than lightening, which benefits the premium look over time. The raw-edge finishes at waist and ankles sit with light compression and reduce transitions under overshoes or socks. The zeroPressure Waist construction distributes pressure generously at the waistband and prevents uncomfortable pinching during long periods in the saddle. The X-Frame brace system – derived from the racing series – stabilises the torso area so the tights sit calmly in both aero and upright riding positions. Reflective strips on the lower legs increase visibility in poor light conditions throughout the entire pedal stroke.

Applications and Benefits

These tights show their strengths on cold, rather dry winter days – worn solo over summer bibs or as an additional insulation layer over spring/autumn or winter tights. For very harsh conditions, they integrate seamlessly into a multi-layer system with pieces from the R and TACTICA collections without adding unnecessary bulk. Those who train holistically also use them for running or skiing when no chamois is needed. The combination of minimal bulk, stabilising brace system, and reflective details makes them equally suitable for commuting routes around Zurich as for long base training sessions on road or gravel bikes. The absence of a second chamois also prevents friction points with multiple layers and supports a smooth, efficient pedalling feel.

Fit and Size Guide

The ENDURANCE THERMOBOOSTER BIB TIGHTS S11 fits in regularFit (unisex) and is designed to pull on easily over your usual summer bib shorts. Thanks to raw-edge construction and moderate compression, the profile stays slim, making putting on and taking off easier during indoor warm-ups or pit stops. Available in eight sizes from 2XS to 3XL, they cover a broad spectrum and leave enough room for the desired base layer underneath. For cool to cold, dry conditions, wear them over your summer bibs; in extreme winter weather, add them as an additional insulation layer in an ASSOS layering setup.