These fork protectors (pair) give utmost protection to the fork seals. The principal difference between tight neoprene, and bellows-type protectors is the lack of 'breathing" in and out. Over the life of the motorcycle the summation of the shock seal distance traveled comes from the first few inches, and when this area of the stanchion is kept clean, dust and mud-free, (and bug-free) the seals will have the longest service life.
This "Sleeve type" is a more elegant fit & most effective but requires sliding the forks out of the topclamps to install. Please see the instructions. 044-2102 is the same but with velcro closure for very easy installation.