From La Sportiva:
"This six layer synthetic boot has an integrated highly water resistant gaiter that opens with a Riri Storm® zipper for excellent water resistant warmth. The inner boot uses thermally expanded PE foam and a polyamide layer for warmth. The shock absorbing PU midsole makes these boots comfortable on long approaches and the 8-9mm TPU midsole stiffener accepts automatic crampons.
"WEIGHT: 34.67 oz • 983 g LAST: Nepal CONSTRUCTION: Board Lasted GAITER: Elastic Cordura/ Schoeller® -Dynamic™ with water repellant membrane/ Vibram® rubber rand/ Elastic nylon with impermeable insulating layer/ Riri Storm® zipper UPPER: High tenacity nylon/ Insulated anti-dragging felt/ Insulated PE/ Insulating aluminum layer LINING: Polyamide Thermic layer/ Mesh INSOLE: Insulating Ibi-Thermo 9mm MIDSOLE: 8-9mm TPU/ PU Inserts/ SBR Aircushion SOLE: 8-9mm TPU/ PU Inserts/ SBR Aircushion"
MSRP is $525 but they have been advertised as low as $399