INEOS Grenadier Interior Insulated Window Covers

Sleep in a Grenadier on a cold night and the glass is the weak point. Bare window glass has effectively no insulating value, so it bleeds your body heat straight out and then collects the condensation that comes back as morning drips on your sleeping bag. In summer it works in the other direction and the cabin cooks. These interior covers sit on the inside of the glass, which is where an insulation layer has to be if it is going to slow heat moving through the window at all.

They are cut specifically to the Grenadier's window openings and held by suction cups, so they seat cleanly against the glass with no gap around the edge for warm air to sneak through. You choose the insulation: none, if all you want is blackout privacy; closed-cell foam, which is a moisture-proof barrier and the practical all-round choice; or premium Havelock Wool, which insulates and, unlike foam, can absorb and release moisture, so it manages condensation rather than letting it run down the glass. Unless you tell us otherwise, the glass-facing side is black, so from the outside the vehicle just reads as dark windows instead of advertising that someone is sleeping inside.

What to know before you buy

Each style option covers one set of windows, not the whole vehicle: front doors, mid-vehicle doors and rear cargo windows are ordered separately. If you want the whole cabin blacked out, you need all three. The "No Insulation" option is a privacy and blackout panel only; it will not do anything meaningful for heat retention.