The warmth of this jersey is provided by the Altura Thermo™ thermosuede fabrics, the lightly brushed inner face trapping air that's warmed by the body to provide an insulating layer against cool temperatures. The fabric is also nicely breathable so as you work up some wamrth any moisture can escape to help reduce wind-chill. Altura's Darkproof® technology provides the all improtant reflective visibility after dark, offering superior retroreflectivity whereby more light is returned to the light source than standard reflectives. Read more… The NV360°™ performance offers 360 degree reflectivity for maximum dark light visibility so you'll be easier to pick out by other road users. With a relaxed but ergonomically designed fit, added warmth and high levels of visibility this short sleeve jersey is the ideal garment for early morning and late evening commutes during spring and summer.