Puma’s DISC SYSTEM has been revamped. It’s now simpler, and mounted on performance-based running shoes, is much smaller.
I actually tried running in them and feel they make perfectly good running shoes. The closing system is without shoelaces and not strange and gimmicky which is often the case. To fit you simply turn the click-wheel disc when wearing, you hardly ever notice the disc while running.

http://jp.puma.com/jp/ja/pd/プーマ-イグナイト-ディスク/188616.html?dwvar_188616_color=02#start=15