Castelli Cold Days 2nd women sleeveless base layer - Black

Castelli Cold Days 2nd women sleeveless base layer: advanced insulation for winter cycling

The Castelli Cold Days 2nd women sleeveless base layer is an innovative solution for those who practice cycling in cold conditions. Made with Polartec® Alpha® 90, an active insulating fabric in recycled PET, this Jersey delivers superior thermal performance without adding excessive weight. Unlike traditional technical base layers, Polartec® Alpha® retains elasticity and softness, ensuring comfort during long rides on gravel and road. The high-loft structure of the fabric creates air chambers that trap body heat, providing a 5 °C increase in thermal comfort. This second layer proves especially effective when worn over a long-sleeve technical base layer, creating an optimal combination for riding in sub-zero temperatures.

Ergonomic design and versatile use

The design of the Jersey was developed with the specific needs of cyclists in mind. The half zip positioned slightly off-center reduces bulk in the neck area, avoiding annoying fabric build-up. This solution allows you to regulate ventilation without creating extra volume in the lower torso area. The close fit allows the Jersey to be worn either inside or outside the Bib tight, adapting to different personal preferences. Compatibility with technical base layers such as Flanders, Bandito, Miracolo and Seamless expands pairing possibilities, allowing cyclists to customize their thermal layering system according to weather conditions and individual preferences.

Thermal performance and environmental sustainability

The maximum breathability of Polartec® Alpha® 90 ensures that moisture generated during physical effort is effectively dispersed, preventing the sticky feeling typical of other insulations. The fabric, made from recycled PET, represents an environmentally conscious choice, reducing the ecological impact of production. Polartec® Alpha®'s active insulation technology works in synergy with the body's natural thermoregulation systems, retaining warmth without compromising breathability. This makes the Jersey ideal for long winter rides, where moisture management is crucial to maintain comfort and prevent hypothermia.

Technical features

• Polartec® Alpha® 90 high-loft fabric in recycled PET.
• Thermal increase of 5 °C compared with standard base layers.
• Half zip with off-center placement to reduce bulk.
• Close-to-body fit.
• Maximum breathability and moisture management.
• Compatible with long-sleeve technical base layers.
• Suitable for gravel and road cycling in cold conditions.
• Stretch fabric for freedom of movement.
• Sleeveless for versatile use.
• Active insulation for superior thermal performance.
• Color: Black.

Orders are usually shipped within 24-72 hours (1-3 days) from payment receipt. Some items may have longer shipping times (5-7 days). The specific shipping times are indicated on each product page.

Shipping costs start from

Shipping times and costs may vary depending on the delivery country, chosen service, and weight.

Shipping with InPost service

Bicycle shipping

Shipping costs for all bicycles are fixed as follows.

Non-EU shipping

Local VAT and any customs duties for shipments of goods to customers outside the European Union (non-EU) will be charged to the recipient and requested by the courier at the time of delivery. If the delivery is not made due to refusal to pay the customs duties (local VAT and any applicable tariffs) requested by the importing country, all costs incurred by us for the return of the goods will be deducted from the refund.

In-store pickup

All online-ordered items can be picked up at the All4cycling store in the province of Varese, Via Gianfranco Miglio 2, 21045 Gazzada Schianno (VA).

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