{"product_id":"bircen-photochromic-cycling-glasses-mountain-bike-sports","title":"BIRCEN Photochromic Cycling Glasses for Men \u0026 Women, B-transparent black frame, Photochromic Black Lens, TR90 wraparound","description":"\u003cp\u003e\u003cstrong\u003eBIRCEN Photochromic Cycling Glasses are lightweight, TR90-frame sports sunglasses with UV400 photochromic lenses that automatically darken or lighten to keep vision clear across changing light while you ride, run, or play.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhether you're tackling singletrack at dawn, cruising a sunny road, or moving between sunlit and shaded sections on the trail, these BIRCEN cycling glasses adapt so you don’t need to switch eyewear. Built from flexible TR90 material, the wraparound frame stays comfortable under helmets and during long sessions, while the photochromic lenses respond to UV intensity for consistent contrast and protection. The design balances coverage, airflow, and low weight so they perform across mountain biking, road cycling, running, and field sports.\u003c\/p\u003e\n\n\u003ch3\u003eHow do the lenses react to changing light conditions?\u003c\/h3\u003e\n\u003cp\u003eThe photochromic lenses in the BIRCEN cycling glasses automatically adjust tint according to UV exposure, reducing glare in bright sun and clearing in low light so you retain visual detail without swapping lenses. They provide UV400 protection against UVA and UVB rays and maintain contrast for terrain reading.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePhotochromic chemistry darkens in strong UV and fades in shade or indoors\u003c\/li\u003e\n  \u003cli\u003eUV400 rating blocks harmful UVA\/UVB wavelengths\u003c\/li\u003e\n  \u003cli\u003eSmoother transitions reduce eye strain on mixed-light routes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill the frame stay comfortable during long rides and impact situations?\u003c\/h3\u003e\n\u003cp\u003eThe BIRCEN frame uses TR90, a high-flex polymer known for being exceptionally light and shock resistant. The wraparound shape distributes pressure evenly, fits well with helmets, and resists deformation from drops or knocks typical in active use.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTR90 frame offers flexibility and impact tolerance\u003c\/li\u003e\n  \u003cli\u003eErgonomic wraparound fit reduces wind and dust intrusion\u003c\/li\u003e\n  \u003cli\u003eLow weight minimizes fatigue on extended outings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these glasses versatile enough for multiple sports and outdoor activities?\u003c\/h3\u003e\n\u003cp\u003eYes—BIRCEN designed these sports sunglasses to function across cycling, running, baseball, golf, beach sports, and everyday outdoor use. The balanced lens coverage and aerodynamic profile make them a practical single-pair solution for athletes who move between different light and activity conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWide lens field improves peripheral awareness for trail and road users\u003c\/li\u003e\n  \u003cli\u003eSecure fit keeps lenses in place during rapid movement\u003c\/li\u003e\n  \u003cli\u003eSleek styling and neutral lens color suit many sports and casual wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does BIRCEN support customers if something goes wrong?\u003c\/h3\u003e\n\u003cp\u003eBIRCEN provides customer-first after-sales support, with options for returns, replacements, or refunds if the glasses arrive damaged or fail to meet expectations. The aim is a straightforward resolution so you can get back to training or riding quickly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDedicated support team for easy returns or exchanges\u003c\/li\u003e\n  \u003cli\u003eClear warranty and refund pathways for faulty items\u003c\/li\u003e\n  \u003cli\u003eResponsive help to resolve fit, damage, or performance concerns\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: These BIRCEN photochromic cycling glasses are intended for active people—mountain bikers, road cyclists, runners, and multi-sport athletes—who want one reliable, adaptable pair of sunglasses that handles variable light, stays comfortable under a helmet, and offers solid UV protection. If you prefer lightweight gear that shifts with changing conditions and requires minimal fuss, these glasses are a practical choice.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do the lenses block UV rays?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The BIRCEN lenses provide UV400 protection, blocking both UVA and UVB rays.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I wear them with a cycling helmet?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Absolutely. The ergonomic wraparound TR90 frame is helmet-compatible and stays secure during rides.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"BIRCEN","offers":[{"title":"Default Title","offer_id":48022105358497,"sku":"B0DQWPVWCW","price":80.31,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0758\/6532\/5729\/files\/bircen-front-packaging.jpg?v=1791325251","url":"https:\/\/canadiansporting.ca\/products\/bircen-photochromic-cycling-glasses-mountain-bike-sports","provider":"Canadian Sporting","version":"1.0","type":"link"}