Preferred mask backing closures. (Velcro/ZIpper/Etc.)

We've been using Velcro cut into 4" strips that close the back of the mask. This has worked great so far but it has its downfalls. The Velcro can get messy or stick to other parts, making Velcro high maintenance.. Cutting the Velcro into 4" strips really helped with this but we're still looking for alternatives. We've thought of using zippers but we are afraid it will be a mess of zipped hair and fur if someones not careful.

Anyone mind sharing some pros and cons for techniques they have used or experimented with? We would really appreciate it!