Winter bib tights engineered for layering over summer-weight bib shorts, using alone for winter cross-training, or adding 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 Thermo Booster 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.Specifications:- Compositions: Main Fabric 76%Polyamide 24%ElastaneTechnology:Featured Fabrics:- RX EVO Plus is the most thermally insulating of the 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 resists abrasion, and it stays black rather than showing white elastic while stretching.