you can't stop sand to stuck in blanket so don't worry and enjoy your vacation at beach. Be Happy

Foldable Fleece Blanket is a perfect beach or park blanket. It has a soft fleece top and a lightly padded waterproof surface on the bottom that makes it great for using outside. The blanket is huge, but easy to carry as it folds into a compact shape about the size of a small briefcase and holds together because of an innovative flap with handle that connects via a velcro strip. It's very light to carry.

Never mind. You can use the washing machine

it's ok

Yes it does. I had a fleece sleeping bag and it would take forever to shake the sand out of it.