High Density Memory Foam Cut to fit Shoe Boot Insoles memory foam Self forming - insole fashions itself around your unique foot shape. Memory rebound System TM - is a unique type of memory foam that remembers your foot imprint for better support with each step. Provides natural cushioning, helps absorb impact shock and reduce foot fatigue. Thin enough to fit in almost any shoe cut to fit E36 UK 2 to E45 UK11/12. Better support  better form to your foot means better support and comfort