{"product_id":"maglia-intima-senza-maniche-castelli-cold-days-2nd-nero","title":"Castelli Cold Days 2nd sleeveless base layer - Black","description":"\u003ch3\u003eCastelli Cold Days 2nd sleeveless base layer: advanced insulation for winter cycling\u003c\/h3\u003e\n\u003cp\u003eThe \u003cb\u003eCastelli Cold Days 2nd sleeveless base layer\u003c\/b\u003e is an innovative solution for those who practice \u003cstrong\u003ecycling in cold conditions\u003c\/strong\u003e. Made with \u003cstrong\u003ePolartec® Alpha® 90\u003c\/strong\u003e, 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 fabric’s high-loft structure creates air pockets that trap body heat, providing an increase of \u003cstrong\u003e5 °C in thermal comfort\u003c\/strong\u003e. This second layer proves particularly effective when worn over a long-sleeve technical base layer, creating an optimal combination for riding in sub-zero temperatures.\u003c\/p\u003e\n\u003ch3\u003eErgonomic design and versatile use\u003c\/h3\u003e\n\u003cp\u003eThe design of the Jersey was developed with cyclists’ specific needs in mind. The \u003cstrong\u003ehalf zip\u003c\/strong\u003e, positioned slightly off-center, reduces bulk in the neck area, avoiding uncomfortable fabric buildup. This solution makes it possible to adjust ventilation without creating extra volume in the lower torso. The \u003cstrong\u003eclose fit\u003c\/strong\u003e 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 options, allowing cyclists to customize their thermal layering system based on weather conditions and individual preferences.\u003c\/p\u003e\n\u003ch3\u003eThermal performance and environmental sustainability\u003c\/h3\u003e\n\u003cp\u003ePolartec® Alpha® 90’s \u003cstrong\u003emaximum breathability\u003c\/strong\u003e ensures that moisture generated during physical effort is effectively dispersed, preventing the sticky feeling typical of other insulations. The fabric, made from \u003cstrong\u003erecycled PET\u003c\/strong\u003e, represents a conscious environmental choice, reducing the ecological impact of production. Polartec® Alpha® active insulation technology works in synergy with the body’s natural thermoregulation systems, retaining warmth without compromising breathability. This feature makes the Jersey ideal for \u003cstrong\u003eextended winter rides\u003c\/strong\u003e, where moisture management is crucial to maintaining comfort and preventing hypothermia.\u003c\/p\u003e\n\u003ch3\u003eTechnical features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003ePolartec® Alpha® 90 high-loft\u003c\/strong\u003e fabric in recycled PET.\u003c\/li\u003e\n\u003cli\u003eThermal increase of 5 °C compared with standard base layers.\u003c\/li\u003e\n\u003cli\u003eHalf zip with off-center placement to reduce bulk.\u003c\/li\u003e\n\u003cli\u003eClose-to-body fit.\u003c\/li\u003e\n\u003cli\u003eMaximum \u003cstrong\u003ebreathability\u003c\/strong\u003e and moisture management.\u003c\/li\u003e\n\u003cli\u003eCompatible with long-sleeve technical base layers.\u003c\/li\u003e\n\u003cli\u003eSuitable for \u003cstrong\u003ecycling gravel and road\u003c\/strong\u003e in cold conditions.\u003c\/li\u003e\n\u003cli\u003eStretch fabric for freedom of movement.\u003c\/li\u003e\n\u003cli\u003eSleeveless for versatile use.\u003c\/li\u003e\n\u003cli\u003eActive insulation for superior thermal performance.\u003c\/li\u003e\n\u003cli\u003eColor: Black.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Castelli","offers":[{"title":"XS \/ Black","offer_id":54456348836186,"sku":"4526521-010-XS","price":100.0,"currency_code":"EUR","in_stock":false},{"title":"S \/ Black","offer_id":54456348868954,"sku":"4526521-010-S","price":100.0,"currency_code":"EUR","in_stock":false},{"title":"M \/ Black","offer_id":54456348901722,"sku":"4526521-010-M","price":100.0,"currency_code":"EUR","in_stock":false},{"title":"L \/ Black","offer_id":54456348934490,"sku":"4526521-010-L","price":100.0,"currency_code":"EUR","in_stock":false},{"title":"XL \/ Black","offer_id":54456348967258,"sku":"4526521-010-XL","price":100.0,"currency_code":"EUR","in_stock":false},{"title":"XXL \/ Black","offer_id":54456349000026,"sku":"4526521-010-XXL","price":100.0,"currency_code":"EUR","in_stock":false},{"title":"XXXL \/ Black","offer_id":54456349032794,"sku":"4526521-010-XXXL","price":100.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0532\/7139\/6534\/files\/Maglia-intima-senza-maniche-Castelli-Cold-Days-62.jpg?v=1784747276","url":"https:\/\/www.all4cycling.com\/en\/products\/maglia-intima-senza-maniche-castelli-cold-days-2nd-nero","provider":"All4cycling ","version":"1.0","type":"link"}