The Comfort Light collection utilizes Sea to Summit's Delta Coring System, which reduces 40% of the core while providing perfect insulation, even in the coldest environments. Delta Coring is a new innovative approach to significantly reduce the weight and mass of the polyurethane foam core of a self-inflating mattress. The patented design and unique manufacturing technique optimize this process, reducing 40% of the original volume and weight of the PU foam. The Delta cores are individually tailored for the different models of mattresses. The revolutionary aspect of the new Delta Coring cores is that the upper and lower connections to the outer material are completely bonded without gaps. This ensures that Sea to Summit provides a 100% unit that has no cold bridges.