Bobster Invader Photochromic Sunglasses have Grilamid TR90 Frame. Ignite sparks with these glasses from Bobster that are ideal for the practical, yet style conscience person. The wrap around frame of these Bobster Eyewear is made of flexible, durable Grilamid TR90 and the open cell foam keeps wind and debris out of your eyes. Continue wearing this piece of eyewear by Bobster from day into evening due to the photochromic lenses, which adjusts to UV light. The Bobster Invader photochromic lenses have a transmission rate of 47% while in low light conditions to 15% while in the sun.