In the late fall and early spring, when you're not ready to submit to winter or anxious to start your season out on the road or trail as soon as possible, we can claim confidently that The Castelli Illumina Women's Knickers are worth their weight in gold. Or rather, we would claim that if the Illumina Knickers weighed more than the claimed 163 grams for size Small. They're definitely far more valuable than that. The Illumina's Thermoflex material has a brushed lining for a soft, fleecy finish that traps heat and wicks moisture, keeping you warm and dry, and Riga 3D rib knit inserts at the waistband and in the side panels keep you from getting too hot. The tights also include a KISS3 Donna insert, which strategically distributes padding for comfort, eliminates seams and chafing, and is antimicrobial. A bit of elastic with silicone grip at the knee keeps everything in place. Castelli's suggested temperature range for the Illumina is 54 to 64 degrees Fahrenheit, but we find that, when paired with some shoe covers, long sleeves, and gloves, the Illumina can ride easily in the mid 40s. The Castelli Illumina Women's Knickers are available in five sizes from X Small to X Large in the colors Anthracitecoral, Anthracitelime, and Anthracitemagenta.