Keep your insulin vials safe in our high-impact silicone protective sleeve. Reusable and easy to put on! Just slip vial through square cut-out on side. Top of vial is uncovered so you can easily fill a syringe or insulin pump reservoir without removing the silicone protector. Keep insulin safe for travel and home. Great to protect Humalog, Fiasp, Novolog, Vetsulin, NPH, Levemer, Novolin, NovoRapid, Semglee, Lyumjev, Caninsulin and Tresiba vials. Works with other medications too. Note: Does not fit Humulin R 500ml, or Lantus and Apidra tall vials.