Method Seven Revolution HPSx Transition Limited Release Grow Room Glasses Sunglass by day, grow glass by night. The HPSx lens is a proprietary polycarbonate blend that allows it to transition from the signature blue of Method Seven's HPS color-balancing technology to a dark grey/blue tint when exposed to direct sunlight. Durable Italian-crafted acetate frame features concealed flex hinges and a wide fit for a clean look and maximum comfort HPSx lens made in the USA. Hardshell case and microfiber pouch included for proper cleaning and storage. UV protection including UVC