Sweetnight 3 Inch Gel Memory Foam Topper

I purchased the Sweetnight Spring Hybrid Mattress - Queen 60*80 inch Item# SN-M008-Q a few years back. I purchased the 2" topper from Sweetnight to use on top of the Sweetnight mattress. After a few months of use the topper shrunk in length about 3". The 2" topper was held in place on the mattress differently than the 3" topper. So I figured I would give the 3" topper a try. After a few months the 3" topper shrunk in length approx 2.5" . The toppers and the mattress are all made by sweetnight so they should continue to fit as in the beginning. If the toppers are prone to shrinkage they should be manufactured 2"-3" longer in the beginning and then shrink to the right size. Mattress is fine the toppers not so much.