The ALPS Insole is tri-laminate with rigid material located between two layers of foam. The top layer of foam is perforated to evenly distribute pressure, while the bottom layer is hih in density to provide added support.
Here are a few of the built-in features from ALPS Insoles:
Thermoformable
Correction of foot pronation and supination
Available with or without matatarsal support
Treats transverse and longitudinal platypodia by grinding lower foam.
ICNR-XX-2/3
High Density Insole with 2/3 length foam and no metatarsal support
ICMR-XX-2/3
High Density Insole with 2/3 length foam and metatarsal support
ICNR-XX
Pediatric High Density Insole with full length foam and no metatarsal support (only available in size code 23-40)
xx indicates size, see sizing chart and illustrations for more details