Restorative yoga is a practice that involves poses held for longer periods of time, with the support of props. The practice involves less poses and not very much movement during the class. 
The aim of restorative yoga is to give the body time to relax and restore itself with the feeling of being held and supported by the props beneath the body. The props assist in helping you to hold poses longer, whilst holding passive stretches. Your muscles are able to fully relax deeply during the long holds of the practice. It’s a unique, dreamy feeling because props, rather than your muscles, are used to support your body. Restorative classes are very relaxed, slow and chilled making them a great complement to more active practices and an excellent antidote to stress and anxiety.
Expect to be in a deeply conscious relaxed state.
You will  be told before the class what props you will need; think blankets, cushions and pillows and lots of them.