This small neoprene sheets of 3mm material are made using high grade CR neoprene. CR neoprene is very flexible and the sheet is double lined with super stretch nylon on both sides of the sheet, making it very stretchy.
This type of neoprene is often used on high end garments because it is very comfortable and flexible. This type of neoprene was used to produce our Venom wetsuit and the underarm area of our Challenger swimming wetsuits to make swimming and arm movement much easier.
Using such a stretchy material like this also helps when making tight fitting garments because it fits the contours of the body much better than less stretchy neoprene.