The Infinite Channel System (ICS) is a slot-based mounting design similar to Burton's Channel. Instead of traditional fixed bolt holes, the board has two lengthwise slots that let you slide your bindings forward or backward for infinite micro-adjustment of your stance position. This makes it easy to dial in exactly where you want your feet on the board.
The big thing to watch for is compatibility. ICS boards don't use standard 4x4 or 2x4 insert patterns, so you need bindings that include the right disc or hardware for channel-style mounting. Many modern bindings from major brands offer compatible discs, but not all do—check before you buy.
ICS is worth considering if you like fine-tuning your stance or experiment with different positions across different terrain. Just confirm your bindings are compatible or that you can get the right adapter disc, otherwise you'll be stuck with gear that won't mount up.