The ice has such little heat compared to your body that the heat rushes from your hand to balance things out. A neutral picnic blanket that folds down neatly, this one is ideal if you're short on storage space. As any al fresco foodie worth their Himalayan sea salt knows, the right picnic blanket is key to serving up the perfect outdoor meal.

This waterproof, sandproof and puncture-proof outdoor blanket is a great compact picnic blanket when you're on the go or on a camping break. For a bivvy I'd use a full length CCF underneath held down by 2 horizontal cords in case I rolled off during night - don't want it blowing away. The sensation that you feel in your hand, through your brain, is that of heat being sucked from your body.Soft and warm, the blanket is slightly narrower than others we tested, but the longer length works well for two people – especially if you want to stretch out and doze after a particularly indulgent picnic. Designed by Decathlon's team of campers, this picnic blanket comfortably protects you from the ground when you're picnicking.

The secret is the fabric – the top layer is a technical polyester that sheds water, and the bottom is a waterproof ripstop nylon that’s durable but light.It has waterproof backing, feels comfortable to sit on, and there's a handy strap for rolling it up and carrying from home to the park. The thermal exchange thing:It is dissimilar to firing quanta across some given interface from which either transition (or set of) is identical whichever side it is done from.