For the Steinheil film type, SGP has 2 type of screen protector for the iPad Air, the Ultra Crystal which is the clear version and the Ultra Optics which is the matte version.
Do not get mixed up with a similar glass screen protector called Spigen SGP GLAS.t Nano Slim Screen Protector for iPhone 5/5c/5s (note the R, GLAS.t vs GLAS.tR). The R stands for rounded because the GLAS.tR glass screen protector have rounded edges for a more precise fit and hence it is slightly more expensive.