ViscoSoft 4 Inch Memory Foam Mattress Topper Short Queen, High Density Ventilated RV Pad, Removable Bamboo-Rayon Cover Review (2026)

Foam density and thickness

This topper uses 4 inches of memory foam rated at 3-plus pounds density, a figure that generally indicates a denser, more durable foam than the thinner 1.5 to 2 pound density toppers sold at lower prices, though it sits below the highest density foams marketed for maximum support. The extra thickness compared with a 2 or 3 inch topper is meant to more fully mask the thin, firm factory mattress common in RVs and campers, which are typically built lighter and less plush than a residential mattress to save weight and manufacturing cost across the whole rig. ViscoSoft states the resilient foam is meant to hold a flat surface over time rather than developing permanent body-shaped valleys the way a cheaper, lower density foam can after repeated use.

RV short queen sizing

The topper is cut to 60 by 75 inches, the RV short queen dimension that is about 5 inches shorter than a standard residential queen mattress, a size difference that exists because RV bedrooms are built to a tighter footprint than a house bedroom. Buying a topper sized specifically for this dimension avoids the overhang or bunching that happens when a standard queen topper is forced to fit a shorter RV mattress platform, where excess material can bunch against the wall or footboard instead of lying flat under the sheets.

Ventilation and the removable cover

ViscoSoft designs this topper with ventilation intended to help release body heat that can otherwise build up in dense memory foam overnight, paired with a removable bamboo-rayon cover that can be taken off and washed. That washable cover matters more in an RV than a house mattress, since dusty campsite conditions, pets, and tighter living quarters all make spills and grime more likely to reach the topper than in a stationary bedroom, and being able to wash the cover rather than the whole foam core extends the topper's usable life.

Added bed height

Stacking 4 inches of foam on top of an existing RV mattress raises the total sleeping surface height by roughly that amount, which can bring the top of the bed uncomfortably close to overhead cabinets or a bunk platform in RVs where the mattress already sits close to the ceiling. Measuring the clearance above the current mattress before ordering is worth doing, since a topper that leaves only a few inches of headroom can make getting in and out of bed awkward, particularly in cab-over bunks or slide-out bedrooms with lower factory clearances than a full walk-around bedroom.

Weight and handling

A 4 inch, higher density foam topper is noticeably heavier and bulkier than a 2 inch topper, which matters when it needs to be lifted to make the bed, flipped for airing out, or removed entirely for a trip when storage space is tight. RVers who regularly reconfigure their sleeping area, such as converting a dinette or removing bedding for travel, should factor in that this topper is not as quick to move as a thinner pad. For a primary RV bed that mostly stays set up in place, that added weight is a reasonable tradeoff for the extra cushioning it provides night after night, and the washable cover means the surface can still be freshened up without wrestling the full foam core off the mattress each time.

Frequently asked questions