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Free UK delivery · Free 30-day returns · sportium.co.uk@gmail.com





Every order ships free with tracking. Timings are on our delivery page.
Email us with your order number within 30 days of delivery and we will send a prepaid returns label. Refunds go back to your original payment method.
Tell us the sport, your level and the measurements that matter at sportium.co.uk@gmail.com and we will help you choose.
KastKing Osage Polarized Sport Sunglasses are lightweight wraparound shades with polarized TAC lenses and Grilamid frames designed for glare reduction, impact resistance, and all-day comfort.
If you spend time on the water, trails, or behind the wheel, these sunglasses are built to deliver clear vision and stay put during active use. The Osage pair combines a protective PuriVex coating, thick optical-grade polarized lenses, and flexible Grilamid construction so you get durable eye protection without bulk. Included accessories—a molded hard case and a Prym1 Camo microfiber pouch—make transport and lens care simple.
The Osage polarized lenses cut glare from reflective surfaces like water and pavement, reducing eye fatigue and making details easier to see. KastKing’s 1.0mm TAC lenses pass optical tests for low distortion, preserving visual accuracy across the field of view.
Yes—the frames are molded from Grilamid, a high-performance polymer known for its light weight, flexibility, and resistance to heat and UV exposure. Non-slip nose and temple pads keep the glasses secure through vigorous movement, while the wrap design increases coverage without adding heft.
KastKing offers smoke, brown, and copper base lens options so you can match tint to conditions. Smoke gives natural color balance in bright sun, brown boosts contrast on partly cloudy days, and copper performs well in lower light or variable conditions.
Wipe lenses with the included Prym1 Camo microfiber pouch after rinsing off grit and saltwater; the PuriVex coating helps resist smudges and scratches but still benefits from gentle care. Store the glasses in the molded custom hard case when not in use to protect frame shape and lens integrity.
Who is this for: The KastKing Osage Polarized Sport Sunglasses suit anglers, boaters, cyclists, hikers, and everyday commuters who need reliable glare reduction, durable construction, and a secure fit. They’re a good match for anyone wanting sports-grade optics and frame materials without paying premium brand prices—ideal for active men and women who demand performance, comfort, and easy upkeep.
Q: Do these sunglasses block UV rays?
A: Yes. KastKing Osage sunglasses block 100% of UVA and UVB rays and meet or exceed U.S. ANSI standards.
Q: Can I swim or sweat in them without damage?
A: Yes. Grilamid frames resist water and heat; the PuriVex-coated lenses repel salt, oil, and dirt for outdoor use.
Delivery: free and tracked to addresses across the UK, with no minimum spend. We email your tracking link as soon as your order is dispatched; timings are on our delivery page.
Returns: 30 days from delivery to return an unused item in its original packaging free of charge, with a prepaid label. This is on top of your 14-day legal right to cancel, and your Consumer Rights Act protections for faulty goods.
Damaged or wrong item? Email us a photo at sportium.co.uk@gmail.com and we will replace or refund it.
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