{"product_id":"sottocasco-castelli-estremo-thermal-nero","title":"Castelli Estremo Thermal underhelmet - Black","description":"\u003ch3\u003eCastelli Estremo Thermal underhelmet: Protection and Warmth for Winter Cycling\u003c\/h3\u003e\n\u003cp\u003eThe \u003cb\u003eCastelli Estremo Thermal underhelmet\u003c\/b\u003e is the ideal solution for those who practice \u003cstrong\u003ewinter cycling\u003c\/strong\u003e and seek uncompromising protection. Made with \u003cstrong\u003ePolartec® AirCore™\u003c\/strong\u003e on the front panels, it provides an effective barrier against the wind while maintaining a compact profile under the helmet. The \u003cstrong\u003eWarmer\u003c\/strong\u003e fabric placed on the back promotes \u003cstrong\u003ebreathability\u003c\/strong\u003e and moisture evacuation, preventing the buildup of humidity. This balance between thermal insulation and moisture management makes it particularly suitable for extended training sessions in cold conditions, where body temperature regulation is essential for comfort and performance.\u003c\/p\u003e\n\u003ch3\u003eThermal Technology and Optimized Ventilation\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003ePolartec® AirCore™ technology\u003c\/strong\u003e ensures wind protection without adding significant bulk, an essential feature for those wearing the underhelmet beneath a helmet shell. The thickness has been calibrated to provide \u003cstrong\u003emaximum warmth\u003c\/strong\u003e while maintaining compatibility with any road or mountain bike helmet model. The double-layer structure, with Warmer on the back, creates a \u003cstrong\u003ethermal management\u003c\/strong\u003e system that allows sweat to evaporate quickly, reducing the risk of sudden cooling during descents or breaks. This configuration is particularly advantageous for those who alternate moments of high effort with phases of active recovery.\u003c\/p\u003e\n\u003ch3\u003eFull Coverage and Lasting Comfort\u003c\/h3\u003e\n\u003cp\u003eThe underhelmet fully covers the ears, protecting the areas most sensitive to cold during winter rides. The \u003cstrong\u003efull ear coverage\u003c\/strong\u003e significantly reduces body heat loss, a critical element in \u003cstrong\u003eroad cycling\u003c\/strong\u003e where high speeds amplify the wind chill effect. The ergonomic design ensures a close fit without creating pressure points, delivering comfort even during long training sessions. Universal compatibility with standard helmets makes it a versatile choice for any cyclist looking to face the cold season with reliable protection.\u003c\/p\u003e\n\u003ch3\u003eTechnical Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFront material: \u003cstrong\u003ePolartec® AirCore™.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eRear material: Warmer fabric for breathability.\u003c\/li\u003e\n\u003cli\u003eCoverage: Full ear coverage.\u003c\/li\u003e\n\u003cli\u003eThickness: Optimized for helmet compatibility.\u003c\/li\u003e\n\u003cli\u003eProtection: Effective wind barrier.\u003c\/li\u003e\n\u003cli\u003eMoisture management: Rapid vapor evacuation.\u003c\/li\u003e\n\u003cli\u003eCompatibility: Universal with road and MTB helmets.\u003c\/li\u003e\n\u003cli\u003eThermal insulation: \u003cstrong\u003eMaximum warmth\u003c\/strong\u003e in winter conditions.\u003c\/li\u003e\n\u003cli\u003eWeight: Minimal bulk under the helmet.\u003c\/li\u003e\n\u003cli\u003eColor: Black.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Castelli","offers":[{"title":"One size \/ Black","offer_id":54465229881690,"sku":"4526531-010","price":45.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0532\/7139\/6534\/files\/Sottocasco-Castelli-Estremo-Thermal-Nero-All4cy-22.jpg?v=1784833266","url":"https:\/\/maisoncalyx.shop\/en\/products\/sottocasco-castelli-estremo-thermal-nero","provider":"All4cycling ","version":"1.0","type":"link"}