The slim models are made with 30mm thin foam instead the 50mm standard. The slim models are the lightest weight most compact version we make and design for those who need the table to be as compact and little as possible. In order to keep the table comfortable and also available with a face hole (not only headrest extension) we designed a special contoured extra thick 50mm face hole. The models made with nylon mesh instead of plywood base are especially more comfortable as the mesh provides that extra give and softness to soothe the relativity thin foam 

Please note - Weight can change depends on the batch of aluminium and foam which can be different. The weight we advertise for each model is the average weight of that model. Meaning sometimes it can be up to + - 10% lighter or heavier but mostly close to that weight