For most applications, choose the boots made from elastomerics (the standard is silicone rubber with other materials available), that feature ruggedness with a wide operating temperature range and tactile responsiveness. This is especially important with smaller size toggles that have lower operating force ranges. Most boots are rated for Type 4X and 6P environmental exposure (equal to IP66 / IP68 protection), will operate for 100,000 plus actuations, are third party Recognized by Underwriters Labs (UL), and are designed and manufactured in accordance with MIL-DTL-5423. For very severe environments, especially if subject to high pressure cleaning, APM offers fully armored pushbutton boots clad in stainless steel with integral silicone or fluorosilicone rubber sealing.