La Sportiva K4 S

2 reviews
5-star:   2
4-star:   0
3-star:   0
2-star:   0
1-star:   0



Awesome boot. It's not as narrow as some would say.

Rating: rated 5 of 5 stars
Materials: Benecke CeraComĀ® industrial fabric upper, 3M Thinsulate- PTFE layer, carbon fiber honeycomb, polyurethane-coated leatherette Midsole: TPU to leather Lining
Use: Vertical Ice, General Mountaineering - Mixed Climbing
Break-in Period: Very Short
Weight: 4lbs 14oz
Price Paid: $270

Awesome boot. It's not as narrow as some would say. I do not have a narrow foot at all and these fit perfectly. Also, the fit around the foot and room in the toe box can be customized by adjusting the removable tongue.

Excellent design and thought went into these. I love them. They are very warm, but at really high and extreme situations you would still want a double boot like the Nuptse, in my opinion plastics are in the past. Besides the Nuptse, these are the best boots I've ever had.


The best boot for the price, spent a lot of time in…

Rating: rated 5 of 5 stars
Materials: gore-tex
Use: climbing
Break-in Period: 2 good weeks
Weight: not bad
Price Paid: $234

The best boot for the price, spent a lot of time in Iceland in them and have never had a problem, very warm and great for mixed climbing. The boots makes plastic boots a thing of the past. Spent hours belaying in them in the low teens and never got cold.

Retailers' Descriptions

Here's what other sites are saying:

La Sportiva K4SDesigned as a complete alternative to a plastic boot, the K4S is the lightest and warmest single boot available and will trump any task from mountaineering, to mixed and ice climbs. A layer of 3M Thinsulate provides the warmth while a 6.0mm

- US Outdoor Store

Free Shipping. La Sportiva K4 S Shoe (Fall 2006) The K4 S by La Sportiva is great for winter mountaineering, alpine rock and ice, technical mixed routes and waterfall ice climbing. The K4 S is state-of-the-art technology in a go anywhere, do anything multi-purpose winter mountaineering boot.Features High-tech lasted synthetic materials surround your feet in lightweight protection, warmth and performance Vibram Clusaz provides a crampon compatible sole with a super aggressive heel brake and lug pattern for superior traction Synthetic Benecke CeraCom upper with Thinsulate insulation makes this the warmest, most advanced single mountain boot made Upper Transparent PU-coated embossed Benecke CeraCom PUR leatherette/3mm Idro-Perwanger (over the ankle)/Lorica synthetic leather bellows tongue and padded cuff/Molded TPU ankle & backstay reinforcement/Giugiaro Design lacing hardware/Vibram XSV Rand/Removable EZ Flex Tongue with Dri-Lex lining Construction Makalu Last Vibram Clusaz Sole SBR Aircushion Midsole 5mm insulating honeycomb structure carbon fiber with PU insert Weight 4 lbs. 10 oz.

- Moosejaw

La Sportiva K4 S


The K4 S has been discontinued.

previously retailed for:
$196.95 - $395.00

The La Sportiva K4 S is not available from the stores we monitor. It was last seen August 4, 2008 at US Outdoor Store.

If you're looking for a new mountaineering boot, check out the best reviewed current models.