Very heavy.  Unpacked easily. Daughter helped me by lifting the mattress of the bed then placing left side, then right side. There’s Velcro in the middle. This will keep our memory foam mattress from sagging between the bars in the platform bed. If slats are more than 3 in apart, you need either this or a box spring for support of the mattress. Ours are 7 in apart. ‍♀️.