Telos 2091-00224-000 Protective Sleeves for Infinity Beltpack (Set of 5)Pack of 5 Infinity Beltpack protective sleeves. The protective sleeve is a silicon rubber based cover specially designed to protect the Infinity BP2 and BP4 devices from the kind of impact damage often associated with portable communications devices. The material efficiently transfers heat from the active device to its outer layer, ensuring that the high level of protection does not compromise the performance of the beltpack.