The following is from the Craftsy website. I love Aurifil threads for piecing. I love to match the colour of the thread to the fabric as well. This eliminates thread poking at the seams. Aurifil is available at most quilt shops or contact Mari Lyn at www.bytownethreads.com/aurifil-threads/
1. IF YOU ARE USING HIGH QUALITY QUILTING FABRIC, BE SURE TO PIECE YOUR PROJECTS WITH A HIGH QUALITY THREAD.
When piecing with 100% cotton fabric, it is important to use a 100% cotton thread. Choose a neutral color (many quilters use white, cream or gray for all of their quilting projects) or choose a thread to match the fabrics you’ll be sewing.
Good quality cotton threads produce less lint than lower quality cotton threads and are visibly “smoother” than the lower grades of cotton thread. High quality threads, which produce less lint, are also good for your sewing machine.
An excellent thread choice for piecing is Aurifil Mako 50 weight cotton thread. This thread is silky smooth and fine, while at the same time, it’s strong and durable.