The HTC One GLAS.t Slim is back! At .26mm the GLAS.t Slim is the thinnest glass screen protector available for the HTC One. Rated a hardness level of 8H-9H the protection provided by the tempered glass is unmatched. While the GLAS.t Slim is 35% lighter, the clarity still remains stunning. With the reduced weight and unadulterated clarity, you wont even know its there.