For sewing stitches that are invisible, clear monofilament thread is the preferred choice of thread and comes in a variety of sizes depending on the application and thickness of thread required. Monofilament can also come in a smoke color which has a semi-translucent appearance that may help in blending in with fabric. Monofilament is preferred when you can’t match a thread color exactly to your fabric leaving invisible stitches. To best match your fabric, clear monofilament should be used with lighter fabric colors while smoke can be used with darker colored fabrics. Size of the thread refers to the thickness of the thread. Strength and visibility increases with the increase in size of the thread. Monofilament thread can be purchased with or without a canister depending on how you store your thread products.