First you need to know what model of MacBook you have. From your MacBook Choose Apple menu > About This Mac. This will tell you the model, size and approximate date of manufacture of your MacBook. We currently sell covers in 7 distinct sizes:
Glitty for Macbook Pro Retina - available in 13" and 15" - Fits MacBook Pro models from 2012 - 2015
Glitty for Macbook Pro Touchbar - available in 13" and 15" - Fits MacBook Pro models from 2016-2017
Glitty for Macbook 12' - Fits MacBook 12" models from 2016-2017
Glitty for Macbook Air - available in 11" and 13" - Fits MacBook Air models from 2012 - 2017
Selecting the right cover is important as each cover was designed to exactly fit the cover of your MacBook. Earlier models of MacBook may not be compatible with Glitty.