For broad-chested breeds, you have an option to give your dog extra room with Alpine Dog Coats in all sizes with the Chest Extension Strap. Features: Made with the same sturdy materials featured in Alpine coats Reflective webbing material Quick-snap buckles work seamlessly with Alpine coat buckles Webbing is 3 inches long 5 inches total extra length including buckles Two sizes available: Coats XS-XL 3" long webbing (5" total extension with buckles) x 5/8" wide Coats 2XL-5XL 3" long webbing (5" total extension with buckles) x 1" wide Multiple straps can be used together for the largest of breeds (sold individually) ** Please note, while the smaller strap will work with our old Alpine coats, the larger strap will not. Adjustments to the buckle were made starting in 2021 for new coats and the old buckles are not compatible. Incompatible with all Alpine Tuf Terrain Coats