The silicon strap on Tactical 5.11 Sentinel/Guardsman watch is flexible, durable, and comfortable and adjusts to fit almost any wrist. Tactical has added the unique feature of debossed instructions to the underside for using the watch dial as a compass. It promises years of dependable service but is easy to replace if needed. Kit includes a complete strap and two replacement steel spring pins. The Sentinel Wrist Strap is abrasion-resistant to keep its good looks. and will not stretch out over time also is easy to clean. Its features: durable silicon waterproof dive strap and heavy-duty stainless steel buckle and tab closure. Material: Silicon.