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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.
The Osage uses 1.0mm polarized TAC lenses engineered to cut reflected glare and improve contrast. KastKing’s TAC lenses pass double-decentering checks to limit optical distortion, which reduces eye fatigue during extended wear. A PuriVex coating further repels water, oil, salt, and dirt so the lenses stay clearer longer in marine and outdoor conditions.
Frames are molded from Grilamid, a lightweight, heat- and UV-resistant polymer used in high-performance gear. The material provides strong impact resistance and long-term shape retention while remaining flexible for a comfortable fit. Silicone-like nose and temple pads provide tacky grip to prevent slipping when you sweat or move quickly.
Lens tint influences contrast, brightness reduction, and color perception. Smoke lenses give the most natural color rendering and work best in bright sunlight. Brown tints lift contrast and depth perception for varied light, while copper shades are suited to low-to-moderate light situations where enhanced contrast helps pick out detail.
The Osage ships with a molded hard case plus a Prym1 Camo microfiber pouch that doubles as a cleaning cloth and soft storage option. Clean lenses with the included microfiber pouch and rinse salt or heavy grime with fresh water before drying. Store inside the hard case when not in use to protect the frames and PuriVex lens coating from scratches and impacts.
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: Are the lenses scratch-resistant?
A: The PuriVex coating repels dirt and resists scratches, improving durability though care is still recommended.
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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