I Bought these covers to protect my EON-612's a little reluctantly as they do seem quite expensive. They are a work of art though! Once the cover goes on it can stay on. the front of the cover unzips and can be rolled up and secured with the velcro fixings (there is a gauze which remains to still give some protection even in this mode). There are velcro access flaps at the back to allow access to the power amp controls/connections and flaps on the side which give access to the handles and can be propped open to allow air to circulate during use. The build quality appears good, although only a lot more gigging will prove this. Fantastic service as always from Thomann!