A kind of rollerblades. Not like ordinary inlineskates, and not like aggressives, but a sort of mix. Freeskates has way smaller wheels than inlines, but bigger than aggressives. It also has much better support for the legs than inlines, but no soul platesl like aggressives has. Salomon FSK is considered to be the best brand for freeskates.
The point with freeskates is to get from A to B, eluding all obstacles.