Difference between an "Outdoor Skate" and "Indoor Skate"
The difference between Indoor/Outdoor Roller Skates are the wheels. The outdoor quad skates feature wheels that are soft which allows for a smoother roll on the non-smooth surfaces such as sidewalks & streets. The indoor quad skates feature wheels which are typically harder than outdoor wheels. A harder wheel will give you a smoother roll on very smooth surfaces like those at skating rinks.