PW-999XL is the “upsize” version of PW-999UL with a few upgrades. In order to suit bigger-size users, the length between the armrests can extend 2 inches, increasing the seat width to 18 inches wide, while the footrest can be extended further out to increase the seat depth. Both front wheels and rear wheels sizes have increased to 8 inches and 10 inches respectively. Now the folding lock lever has changed to a bar, the wheelchair can be easily folded from both sides.