Polyester embroidery threads are more durable and also suitable for high embroidery speeds, colors and luminosity are retained after frequent washing. Viscose yarns may be slightly softer than polyester. Cotton threads are duller, not as abrasion resistant and rougher than polyester or viscose threads.

While trying to convert the Irish into Christians, St. Patrick used the shamrock to explain the holy trinity with each leaf representing the Father, Son and Holy Spirit. The three leaves of a shamrock are also said to stand for faith, hope and love.

Shamrocks vs Clovers For starters, shamrocks always have three leaves, while clovers can have a fourth leaf. Shamrocks are usually green, but you can find purple, green or white clover. Finally, shamrocks grow in clumps, while four-leaf clovers are rare and grow one at a time.

Kevlar(TM) thread is one of the strongest and most fire retardant commercially available threads. It is about 2.5 times stronger than nylon or polyester, has almost no stretch, does not melt, and decomposes at 800F.