Classic Tab Collar is a simplistic adjustable collar with an added extension tab to make finding the D-ring easier.
The Launch Collar is made for people who like more control through a limited-slip function; when things get relaxed, the collar loosens.
Shockwave is made mainly for Bikejöring and Dogscooter with one dog.
Lumac Rebelt was made to be the purebred race belt - everything non-essential was stripped down.