The purpose of a baselayer is moisture management and thermal regulation — two things that work together or against each other depending on the fabric you choose. A lightweight mesh base like the Q36.5 Base Layer 0 wicks aggressively without adding warmth, ideal in summer when you want a dry layer between skin and jersey. The Q36.5 numbering system — 0 through 5 — corresponds directly to warmth level, so choosing the right one for the forecast is straightforward. Assos takes a seasonal approach with dedicated layers for Summer, Spring/Fall, Winter, and Ultraz Winter, each tuned for a specific temperature range. The Ultraz Winter Skin Layer P1 sits at the top of that stack, designed for sustained riding in genuinely cold conditions.

Assos dominates the collection with its full women's Skin Layer range, from the Summer Skin Layer Sleeveless through the Ultraz Winter P1. Q36.5's Base Layer series runs from the open-mesh BL0 to the heavily insulated BL5 Plus Hoodie — a range wide enough to cover everything from summer criteriums to winter training rides. The Assos Cycling Bra and Cafe du Cycliste Cesarine Sports Bra bring performance foundation wear into the mix for riders building a full layering system from the ground up.

Browse the full range of women's cycling apparel, or complete your kit with women's cycling jerseys and women's cycling tights.