Flanders 2 High Neck Warmer Long-Sleeve Baselayer - Men’s

What Our Gearhead® Experts Are Saying:

"The Flanders 2 High Neck Warmer Long-Sleeve Baselayer is the base layer I recommend without hesitation for anyone serious about riding through deep winter. The seamless neck warmer construction eliminates the cold air gap that ruins most layering setups, and at 244 grams, it delivers more warmth per gram than anything else in its category. I wore it on a four-hour ride in 28-degree temps and never once thought about the cold."

Winter riding at the extreme low end of the temperature range demands a base layer that functions as more than just a first layer, and the Flanders 2 High Neck Warmer Long-Sleeve Baselayer from Castelli was engineered precisely for that purpose. When ambient temperatures sit between 25 and 40 degrees Fahrenheit, thermal management at the core and neck becomes the single most important factor in sustaining output and staying comfortable through long efforts. Castelli built this piece to address both with one garment.

The integrated seamless neck warmer is the defining technical feature here, eliminating the gap between a standard base layer collar and the chin that allows cold air to funnel directly to the chest. The seamless construction means no pressure points or bulk at the neck regardless of head position, which matters over the course of several hours in an aggressive riding position. At 244 grams total, the warmth-to-weight ratio sits at the top of Castelli's base layer lineup, making it the anchor piece for any serious cold-weather kit build.

At a temperature range of 25 to 40 degrees Fahrenheit, this base layer is designed to pair with Castelli's heavier mid and outer layers for full system warmth. The regular fit accommodates a jersey or jacket over the top without compressing the insulating air layer that makes the whole system work. For riders committed to winter training blocks rather than the trainer, the Flanders 2 High Neck Warmer Long-Sleeve Baselayer is the foundation the rest of your kit is built on.