Warm and comfortable on the skin, acetate offers an extensive array of color options. 
Lenses offer total defense from UVA and UVB rays as well as maximum glare protection.
Now you can get acetate sunglasses not just in classic tortoiseshell, but in an infinite number of colors and patterns, ranging from black to Caribbean turquoise to clear with a hint of pink. 
Eyewear brands like acetate so much because unlike injection-molded poly-plastics (used for sport and cheap promo glasses) acetate is hypoallergenic. More importantly, it’s thermoplastic, which means your optician can heat the frames and bend them to perfectly fit your face.