Most instructors recommend wearing cycling shoes with cleats that attach to the pedals, which will help you maintain balance and speed during the class. Comfortable and breathable leggings or bike shorts are suggested, as well as fitted tank tops to stay cool. Fitted tops are better than loose t-shirts because they allow the instructor to see your form and make suggestions for improving your posture on the bike.
In addition to your clothing, there are a few accessories that will help you get the most out of your spin workout, including:
Gloves with some grip to help protect your hands from slipping off the handlebars.
A water bottle (that fits in the bottle holder) to keep you hydrated.
A towel to wipe sweat from your face during class.
A hat or hair tie to keep your hair pulled up and out of your face.