adidas RESPONSE Cushion 18 shoes | 23 january 2010 Previous model was quite successful. It even got best design award from Runner's World voters (Thank you by the way). It wasn't an easy job to make this one even better. 18th got new FORMOTION unit on the heel which is slightly lighter. Extra forefoot groove for smoother toe off transition and more supportive upper. Tooling was changed to injection so it is a bit harder then 17th (but it will last longer). Couple more photos below...