Castelli Flanders 2 Long Sleeve Cycling Base Layer 2026

The Flanders 2 Long Sleeve is the warmest base layer in the range, designed to offer comfort and protection on cold-weather rides. Its mid-height collar provides extra neck protection whilst remaining comfortable under a jacket.

Made from 100% multi-denier polyester SottoZero fleece, this base layer combines warmth and softness, ideal for maintaining an optimal body temperature. Merrow flatlock seams reduce chafing and ensure maximum comfort, whilst the mesh underarm panels promote ventilation and moisture wicking during exercise.

The result: a technical base layer that is warm, breathable and comfortable, perfect for tackling winter conditions without compromise.

Technical specifications:

- Colours: Black, Grey
- Sizes: XS to XXXL
- Temperature range: -2°C – 10°C
- Weight: 181 g
- Fit: Regular
- Insulation: 4/5, Water resistance: 1/5, Wind resistance: 1/5, Breathability: 4/5, Lightness: 4/5
- Fabric: 100% multi-denier SottoZero Fleece for warmth and comfort
- Construction: Merrow flatlock seams to minimise chafing
- Ventilation: mesh panels under the arms
- Mid-height collar: extra neck protection in cold weather
- Brand: Castelli

Castelli Size Guide