FIT® Sleeving for Rugged Applications Alpha Wire FIT® Sleeving for Rugged Applications provides heavy-duty protection and is offered in a variety of materials and weaves. This sleeving is suitable for applications that require superior abrasion resistance, have high temperatures, or require resistance to oils, solvents, and chemicals. Wrappable, expandable, and non-expandable configurations are available. Alpha Wire FIT Sleeving for Rugged Applications saves time and space and provides added flexibility and lightweight protection.