The silicone connectors in the corner have two purposes. The first is to enable you to tie your bed linen through the central hole in the connector. The bed linen will have ties in the corner which you can tie to the corners of the duvet. This not only makes it super easy to change your bed linen but also means that the bedlinen stays in place while you sleep and does not move around. The second purpose, is that these connectors can match up with the silicone rings on the All Seasons duvet, so if you have both duvets and want to join them together for a super warm winter duvet, you can use these connectors to hold the two duvets in place.