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Hex Chock (front only)

by: PatentWear

The Story ~ For rock climbers, chocks are essential pieces of equipment used to protect against the consequences of a fall. They are a type of device placed into rock cracks as temporary, removable, non-defacing (and thus “clean”) protection while climbing.

The Story ~ For rock climbers, chocks are essential pieces of equipment used to protect against the consequences of a fall. They are a type of device placed into rock cracks as temporary, removable, non-defacing (and thus “clean”) protection while climbing. This Hex Chock is particularly significant in the world of rock climbing—read on to learn why!

The talented duo of Tom Frost and Yvon Chouinard together established some of the classic routes during the Golden Age of Yosemite climbing. Representative of their routes are: West Face of Sentinel, North Face of Quarter Dome, and, as members of the first ascent team, the North American Wall on El Capitan. As founders of Chouinard Equipment Company, Frost and Chouinard together brought sophisticated new concepts to a wide range of traditional mountaineering equipment.

The Chouinard/Frost invention of the symmetric hexagonal nut in 1971 as an alternative to pitons was a pivotal point in the transition to clean and passive climbing. In a matter of just three years the Hex (short for the trade name Hexentric®, given to the final Chouinard/Frost product from their patent for “polygonal climbing chock” depicted in our PatentWear design) evolved to an exciting and at the time mind-bending asymmetrical pattern that could fit four distinct size ranges all in one device. With typical Frostonian wit, Tom refers to the asymmetrical Hexentric as the “eccentric Hexentric.”

Passive protection in climbing was not new, however. It had begun with the use of stones in cracks in North Wales in 1926 during an ascent of Piggot’s Climb on Clogwyn du’r Arddu. The British had a natural aversion to pitons from a purely ethical viewpoint, and generally frowned upon degrading a climb with either pitons or bolts. The main complement of British gear in the 60s consisted of stones, nuts and chocks with some well-known names like MOAC, Acorn, Spud and Cracker.

The concept of clean climbing was first introduced in Yosemite by the late Royal Robbins. In 1967, armed with a new set of chocks from Joe Brown in Llanberis, North Wales, he made the first ascent of Nutcracker, sans pitons. His famous 1967 Summit magazine article, “Nuts to You” set the stage for a new era of clean climbing. Tom Frost’s 1972 article, “Preserving the Cracks” further promoted the concept, and the influential Chouinard Equipment Catalog of 1972, featuring Doug Robinson’s magnificent “The Whole Natural Art of Protection,” forever set the philosophy of clean hammerless climbing in stone, so to speak. It made a strong push for clean climbing in terms of free protection and relying less on pitons hammered in for protection. The combination of all these factors over a short period of about five years revolutionized climbing as it was previously known in the U.S., and perhaps, just in time. With the explosive growth in climbing—from a few thousand enthusiasts to millions in less than a decade—it is frightening to imagine what could have been lost forever with the continual use of destructive pitons by the coming hordes.

1973 was a vanguard year for clean climbing, with two seminal Yosemite ascents in particular. In July, Bruce Carson made a solo, hammerless ascent of the West Face of Sentinel, the first Grade VI to be climbed clean. In the fall, Galen Rowell, Doug Robinson and Dennis Hennek made a clean ascent of the NW Face of Half Dome. A follow-up article in National Geographic a year later—with a front cover photo of Hennek on the pitch above Thank God Ledge—was the catalyst for a whole new generation of climbers to forego pitons whenever possible, and climb clean.

The Frost/Chouinard Hexentrics® were an important contribution in the transition from an iron era of climbing to one of passive nuts. It wasn’t easy to persuade old-school climbers to give up the use of pitons. The process was gradual, but a younger generation perhaps more open to new ideas was quick to adapt to the use of protection that was both easier and quicker to place and retrieve. More than four decades later the Hex design, now lighter and stronger than ever, is still widely popular with climbers today.

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Product Detail:

Adult Ring Spun Fine Jersey Tee

100% ring-spun combed cotton, 30 singles, 4.3 ounce jersey. Set-in collar of 1×1 baby rib knit. Fabric laundered for reduced shrinkage. Tear away label. Heather colors are 50% ring-spun combed cotton/50% polyester, and Heather Gray is 90% ring-spun combed cotton/10% polyester. The softest most comfortable cotton shirt on the market great for high end clothing brands. Fit type: Classic. Primary brands used: District. NOTE: Classic fit is cut slightly smaller than a Basic Unisex Cotton Tee.

Sizing Chart: Adult Ring Spun Fine Jersey Tee

S M L XL 2X 3X 4X
Width 19" 20" 21.5" 23.5" 25.5" 27.5" 29.5"
Height 28" 29" 30" 31" 32" 32.5" 33"


Measured across the chest one inch below armhole when laid flat.


Measured from high point shoulder to finished hem at back.