The Ultra Sleeve is a high performance, easy to install fiber optic fusion splice protection cover that requires no heat shrink, curing, crimping or gluing. The plastic housing comprises of two halves that fold along a hinge and is delivered in an open position, ready for fused fibers to be placed into the sleeve. Once the fibers are in the protection cover, the sleeve closes and locks, preventing the ultra sleeve from being used again. The locks on the sleeve are what keeps the protection cover from opening, and compresses the acrylic foam to provide a hermetic seal.