The BellyFit Shell Insert attaches directly to jackets that have a zip with at least one slider with VISLON and 5VS on the back of it. Don’t see the VISLON and 5VS or have a longer jacket? – You might need a Zip Adapter. Call us for more details toll free @ 1-855-972-9679. The BellyFit is a zip-in softshell (shown in picture 3, along with Fleece insert sold separatetly) extender that expands the front of your own jacket during pregnancy. You don't need to buy a maternity jacket or borrow a XXXXL. Feel good in your own jacket! While baby-carrying with a soft front-carrier or sling, the Bellyfit allows you to easily wrap your jacket around you and your baby, keeping your baby closer and warmer while outdoors. Wind/water resistant and ready for fall, winter and spring "Snaperoo" adjustable elastic that can be snapped anywhere on the BellyFit for a more custom fit Works with the most popular zip used on jackets - size 5 VISLON (single or double slider) (see important information above to know if your jacket uses this type of zip) Suitable for jacket lengths between 60cm - 80cm (24" –31") (separate adapters available for longer mid-thigh to knee length jackets) Optional snap-on fleece panel for an extra layer of warmth Designed and made in Canada.You only need a zip adapter if the zip on your jacket doesn’t match the zip on the BellyFit. A simple test to know if the zip on your jacket will work with the BellyFit is to check if at least one of the sliders on your jacket has the markings "VISLON" and "5VS" on the back. Your jacket passed the test? The BellyFit will zip right into your jacket without an adapter. SAFETY! Your baby’s safety is your responsibility. Always monitor your baby or child to ensure adequate ventilation and warmth. The BellyFit is NOT a baby-carrier. Always follow the safety instructions of your baby-carrier.