As a company, we have been looking for some time at switching to alternative insulation with initial samples of wool cool being sent to us the beginning of 2017. It's a great product idea however in practice it is not found to perform as well as polystyrene boxes which could lead to increased environmental waste overall which is a concern.
In multiple tests, we placed product straight from the freezer into the wool cool in various configurations with attempts to ensure as airtight as feasible. These were left in a cool place and not subjected to any further handling or vibration which would displace the air in the box during transportation. The results were that the contents defrosted significantly, at best -1 degrees was the temperature 24 hours later. In warmer weather and with transport in parcel network we doubted very much they would hold up.
What have been people's experiences with the wool cool deliveries? Especially given the recent heat wave in the United Kingdom?