**New ASSOS Fall/Winter Collection item November 2025
ASSOS ThermoBooster Bib Tights S11 - no insert winter bib tights are engineered for layering over summer-weight bib shorts, using alone for winter cross-training, or adding extra insulation in the most extreme conditions. The construction is similar to the GT HASHOOGI Winter Bib Tights S11, but the insert is omitted for additional versatility.
The ThermoBooster S11 pushes versatility to the extreme, allowing a number of use cases to adapt throughout winter. For cycling, it layers over your preferred summer shorts without adding the bulk of a second insert. In the most extreme conditions, it adds an additional thermoregulating layer to any Spring Fall or Winter bib tights from the R and TACTICA series. For cross-training, the ThermoBooster adapts to skiing and running, adding an additional element of reflectivity to your workout. However you employ it, the raw-cut finishing and low-volume insulation reduces bulk for layering, unlocking an entire system of winter layering for any outdoor training/exercise.
ASSOS streamlined, unisex regularFit
Technology overview
FEATURED FABRICS
RX EVO Plus is the most thermally insulating of the ASSOS RX EVO family. It resists odor, wraps the large muscle groups in asymmetrical stretch, and traps body warmth with low-volume thermoregulation. The warp knit fabric resists abrasion, and it stays black rather than showing white elastic while stretching.
CONSTRUCTION/FIT
ASSOS streamlined, unisex regularFit and body-contoured shaping reduce seams, eliminating friction for total comfort and easy layering. Raw cut waist and ankles finish with a gently compressive, bulk-reducing hold.
ENGINEERING
//zeroPressure waist: A waist construction developed with a soft, highly elastic material to improve the comfort and hold at the waist, minus any pressure or pinching.
//X-Frame: A suspension design originally engineered for the Racing Series. Limits sag on the lower back, stabilizing the insert and main body panels.
//Reflective: Large stripes on the lower legs increase visibility in low-light, overcast conditions, flashing light throughout the pedal stroke.