Two observation windows of 16 x 16 in let you check on seedlings without unzipping the front and losing the warm air inside, which is the difference between a greenhouse that holds temperature and one that is opened a dozen times a day. The frame stands 55 x 57 x 77 in - tall enough to walk in and work upright - wrapped in a PVC cover on PE-coated tubing. Shelves are spaced 17 in apart, enough headroom for staked tomato starts rather than only seed trays. Four wind ropes, four pegs and four metal stakes ship with it for anchoring on grass or gravel. Net weight is 20 lbs.