KastKing Polarized Sport Sunglasses for Men & Women — Smoke Lenses, TAC Polarized + UV400 Protection

KastKing FlatRock Polarized Sport Sunglasses are lightweight, impact-resistant shades with polarized TAC lenses and full UVA/UVB protection designed for active outdoor use.

These sport sunglasses combine polarizing optics, a scratch-resistant PuriVex coating, and flexible Grilamid frames to deliver clear vision and all-day comfort during activities like fishing, driving, cycling, and hiking. Designed for both men and women, the FlatRock balances durability with low weight and includes protective storage accessories so the lenses stay pristine between uses.

How do the lenses reduce glare and protect my eyes?

The FlatRock lenses use polarized TAC material that helps cut horizontal glare from water, road surfaces, and snow, improving visual comfort and reducing eye strain. KastKing applies a PuriVex PROTECTIVE COATING to the lens surface to repel dirt, oil, and water and to resist scratches from everyday use.

• Polarized TAC lenses for glare reduction and clearer contrast
• PuriVex coating repels contaminants and improves cleaning
• Lens options (smoke, brown, copper, green) match varying light conditions
• Meets or exceeds U.S. ANSI standards for UV protection

Are these frames durable enough for active sports?

Yes — the frames are built from Grilamid, a lightweight, flexible polymer used in demanding applications where strength and shape retention matter. That material provides impact resistance and heat tolerance so the sunglasses hold their shape and stay comfortable through vigorous movement and changing conditions.

• Grilamid construction for exceptional flexibility and toughness
• Lightweight fit reduces pressure during long wear
• Impact-resistant design suitable for outdoor recreation
• UV and heat resistant material maintains frame integrity

What lens color should I choose for my activities?

Lens color influences contrast and suitability for different lighting. Smoke lenses deliver natural color balance in bright sun, brown increases depth perception for mixed light, copper is best for lower light or overcast days, and green offers versatility across sunny to overcast conditions.

• Smoke: natural color reproduction for bright conditions
• Brown: enhanced contrast in varied light
• Copper: boosts visibility in moderate-to-low light
• Green: all-around performance for changing skies

How should I care for and store the FlatRock sunglasses?

KastKing includes a molded hard case and a Prym1 Camo microfiber pouch to protect lenses when not in use and to safely clean them. Gentle cleaning with fresh water and the microfiber cloth prevents scratches and preserves the PuriVex coating; avoid abrasive materials and do not dry with paper towels or expose lenses to saltwater while drying.

• Use included hard case for transport and storage
• Clean lenses with the microfiber pouch and warm water
• Avoid paper towels, abrasive cloths, and saltwater drying
• Store in pouch when carrying to prevent contact damage

Who is this for: The KastKing FlatRock Polarized Sport Sunglasses are suited for outdoor enthusiasts who need reliable glare reduction and lightweight comfort — anglers, drivers, cyclists, and anyone who spends extended time outdoors. They’re a practical choice for buyers looking for durable frames, multiple lens color options for different lighting, and protective accessories to keep eyewear in good condition. If you want polarized performance, scratch-resistant lens treatment, and a flexible, low-weight frame for active days, the FlatRock series is designed to meet those needs.