Bonus points for the cover having holes for the verticals so it lowers with the wood height.
Keeps top 4 or 5 rows dry while allowing air to help air the wood not covered.
Protects from the elements, black cover attracts the sun and helps dry it out faster.
Each end with velcro straps which fit snugly enough to keep the cover in place.
The cover fastens down and will not blow off, protecting dry upper layers of logs.