Roller derby is a sport played on roller skates. It used to be played by both men and women, but it was restarted by women. There are now a growing number of men's and mixed (or co-ed) teams around the world who are playing roller derby.

Modern roller derby is an international sport, mostly played by amateurs.

Derby skates feature low cut boots (like speed and jam skates) but are much more padded than other skates (because derby is a contact sport after all). Derby skates also tend to have a strap to help keep the skater's foot in place better.

The general rule of thumb is to choose a plate size within one inch of your boot size. For example, if you wear a size 8 skate boot, you'll want to choose a plate size between 7-9 inches. In conclusion, finding the right size for your roller derby skates is crucial for optimal performance and safety on the track.