Hennessy Hammock 4Season Expedition Zip M316 review

Hennessy's 4Season Expedition Zip M316 is a large, screened hammock package built around a two-layer bottom intended to hold a foam pad. The standard US listing describes a stock rainfly, suspension ropes and 42-inch TreeHugger webbing, so the basic shelter package differs from the company's separate custom body-and-webbing builder. The important caveat is that the exact M316 page does not clearly itemize the foam pad, space blanket or SnakeSkins in its generic included-items list. This assessment is based on manufacturer material; I have not owned, slept in, measured or tested this hammock.

A 4Season system, not a temperature guarantee

The M316's main distinction is its two-layer bottom: Hennessy lists one 70D nylon layer and one 40D nylon layer, and describes using an oversized open-cell foam pad between them. The company says the pad alone may suit most people to about 40°F, that adding a space blanket could extend use below freezing, and that extra clothing may be added for colder nights. These are manufacturer estimates about particular arrangements, not independent cold-weather tests, a safety rating, or a promise of comfort for every sleeper and sleep system.

There is a package question to resolve before treating those instructions as an included capability. The product text explains how a pad is arranged and packed, but the generic “What's Included” passage does not unambiguously list the foam pad itself or a space blanket. The main product photograph is not proof of box contents. Ask the seller or Hennessy to itemize what accompanies the exact M316 offer, and budget for any missing insulating pieces. If the pad is not supplied, the double bottom alone is not an insulating layer.

Large body, side zipper and attached insect mesh

Hennessy lists the lower fabric at 120 by 59 inches, a six-foot user-height limit and a 250-pound hammock limit. The 120-inch fabric measurement converts to 10 feet; it is not the distance between trees, a promise of usable sleeping length, or a personalized fit result. The published size makes the M316 materially smaller and lower-rated than the brand's 4Season XL configurations, so a buyer should compare the specific body limit rather than treating “4Season” as one size. Make sure the named M316 is the offer under consideration.

The opening is a side Zip with a heavy-duty #10 YKK double-slider zipper. The page lists 30D No-See-Um mesh attached to the body. That is a built-in insect layer, not an overhead rain cover or an underbody warmth rating. The asymmetric shape and structural ridgeline are presented as Hennessy's design features; they do not establish that an individual sleeper will find the diagonal lay comfortable. Try to assess personal fit through the manufacturer's current sizing guidance rather than inferring it from a height limit alone.

What the standard package lists

The standard M316 listing is presented with a stock rainfly and complimentary webbing straps. Its specifications describe a hexagonal fly measuring 143 inches on the center line by 120 inches wide, ten-foot polyester support ropes and 1.5-by-42-inch webbing. The generic included-items description also names the attached mosquito net, detachable fly, ropes and a compression sack with setup instructions. Hennessy lists the supplied straps as tree-hugging webbing, but neither their presence nor the rope's own test figure rates the entire hang, anchors, trees or site.

Hennessy describes a distinct storage workflow for the 4Season line: keep the hammock and pad in the compression sack, store a wet fly in SnakeSkins outside the pack, and pitch the fly before setting up the hammock beneath it in rain. This is useful planning advice but it creates another package check: the exact page recommends SnakeSkins without clearly itemizing them as included in its general list. Confirm them or carry another suitable way to manage a wet fly. The page lists a 15-by-8-by-8-inch packed size and 5 pounds / 2,267 grams before the 3-ounce / 84-gram webbing; however, the paired .json record lists 4.0 pounds for the variant and the .js payload stores 1,814 with no unit. Because the record's contents basis is not stated, the packed-weight discrepancy remains unresolved. Do not use one number as a measured, all-in carry weight.

Fit limits and what the finder can say

For the numeric finder, the M316 has a 10-foot lower-fabric length, a 59-inch lower-fabric width and a 250-pound hammock-body limit. It meets each of those selected minima exactly; raising length above 10 feet, width above 59 inches, or capacity above 250 pounds removes this model. These are useful boundaries for comparing published dimensions, not rankings or personal comfort advice. The body limit also does not become a rating for the supplied webbing, ropes or complete support path.

The standard M316 suits a buyer who wants an integrated screen and stock fly, can accept the listed large-body limits, and is prepared to verify the cold-weather package rather than assuming every pad-related item is in the box. Compare it separately from the 4Season Explorer XL and Survivorman versions, whose body sizes, limits and contents differ, and from the body-only custom Expedition builder, where webbing length and rainfly are selected separately. Before purchase, verify model and SKU, ask for an itemized package, read the current setup and insulation instructions, and check that the intended trees and suspension configuration are appropriate. A finder match reflects only the written facts and chosen numeric thresholds; it does not validate current seller stock, shipment contents, fit, safety or compatibility of an assembled hang.