283 thread count and a drop zipper
This is the heavier cotton build. 283-thread-count organic cotton with a heavy-duty drop zipper, which runs down the side of the encasement rather than across the end.
That detail matters more than it sounds. A side-mounted zipper lets one person fit a deep mattress without lifting the far corner, which is the step where covers get torn and backs get hurt.
Fully zippered, sealed on all six sides, machine washable.