Puckering in machine embroidery is a common problem; no matter how well the file you use was digitized, not using the right backing, needles, and framing technique for your fabric will lead to bad results. The stretchy characteristic is a quality of polyester fabrics that are commonly found in performance apparel such as gym and sports attire and other athletic wear. Embroidering polyester fabrics can be tricky, but by using the right backing, needles and hooping your stretchy fabric correctly you’ll avoid puckering when embroidering polyester.

Here’s a video to help you get it right the first time: