Ah, that makes sense. I got confused because I was sure Fairtex didn't offer S, M, L type sizing for their thai pads. I knew they had Standard. Extra thick and Extra long, but nothing named Large.
I don't really like extra long pads (from any brand) because they seem to have less mobility and I don't really need the extra coverage. In the case of Fairtex Extra Thick, they're actually only slightly thicker than the standard pads of other brands. Fairtex Standard pads are known to be rather thin compared to other thai pads.
I like the Standard Fairtex pads myself. The Windy are good quality too but I have never trained with them. I also like the Combat Sports - Air Thai Pads They are about 1/3 of the weight as regular thai pads and are very thick. They seem to hold up well too.
Check out American Stand up - I have no affiliation but I have some of their gear and it is the best I have found. They are kind of an underground company - they don't do a lot of advertising, but personally, in my opinion, they are about the best you can buy. google American Stand Up and you'll find them