Glacier twill has all the durability and performance characteristics of traditional tackle twill.The biggest difference is a herringbone pattern that adds texture and dimension. Tackle Twill: A Brief History The term "tackle twill" originated from the creation of a tough, durable woven fabric with a cotton face and a rayon back specifically designed for making football pants. Its heavier composition and washability made it ideal for the rough, abrasive treatment it would endure on a football field. As football uniforms evolved into being made with stretchable, breathable performancewear fabrics, users discovered that the old-style tackle twill shrank at a different rate than the uniform. This necessitated a new alternative. Enter Poly-Pro twill, which is used today by many national manufacturers catering to high school, college and professional teams for uniform numbering and lettering. A Supplement to Impressions Fall 2019 * 17