It feels like I hear about a new fabric type every week. Double brushed poly is growing in popularity and is mentioned regularly in sewing Facebook groups and as a fabric option for lots of sewing patterns.
Double brushed poly is a jersey knit fabric that has been brushed on both sides to create a fuzzy texture. It is a polyester-spandex blend and typically has a 4-8% spandex.
I find it curls a lot less than cotton lycra fabric. If your fabric is curling a lot, use sewing clips or pins to flatten it out or consider starching the cut edges of the fabric.
The brushed texture of DBP makes the fabric grip to itself, and it can be tricky to position your fabric. Lifting up and placing the fabric works better than trying to slide the fabric layers together.