As an alternative to heat shrink tubing, sleeving is available. Sleeving costs less than heat shrink tubing and the final product looks fine. Unlike heat shrink tubing, sleeving typically does not shrink. Instead, wire simply fits inside of the sleeving. Popular styles of sleeving include Fiberglass Sleeving and Expandable Polyester Sleeving.

Fiberglass Sleeving is designed and manufactured for high temperature applications. The sleeving is constructed to meet thermal and dielectric requirements. Fiberglass sleeving may meet a plethora of standards such as military specifications and UL listings. The sleeving is offered in a few versions: Heat Treated, Vinyl Coated, Acrylic Coated, and Silicone Coated. Heat Treated Fiberglass Sleeving is often employed where air gap electrical insulation is sufficient. Vinyl Coated Fiberglass Sleeving is ideal for several applications requiring flexibility and toughness. Acrylic Coated Fiberglass Sleeving is ideal for insulating motor leads and a variety of instruments. Silicone Coated Fiberglass Sleeving may be used for the insulation of leads and connections in transformers.

Expandable Polyester Tubing is an exceptionally flexible sleeving product. The tubing is designed to adjust to irregular surfaces to protect cable bundles and wire assemblies. The expandable polyester sleeving also provides abrasion resistance. Like some of other heat shrink tubing and sleeving products, Expandable Polyester Sleeving may be UL recognized. The sleeving is even offered in a flame retardant version.