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The Sunday Afternoons Sun Tripper Cap is built for hikers, trail runners, and backpackers who hate the floppy circumference of wide-brim hats but still need serious sun protection. It takes the classic baseball cap silhouette and injects it with technical trail engineering, most notably a reverse-clamshell folding brim and low-profile mesh ventilation panels that keep you cool on long climbs. The highlight of the Sun Tripper is its folding brim. The bill has a vertical hinge down the center that allows it to fold in half cleanly, sliding flat into a hip belt pocket, running vest, or cargo shorts without warping. Despite its low profile, the UPF 50+ fabric and generous bill length cast reliable shade across your eyes and nose. Strategic mesh side panels provide airflow across the temples, while a moisture-wicking sweatband pulls sweat away from your brow. A concealed pocket inside the crown holds an emergency key or folded cash. The obvious trade-off is total coverage. Because it is a cap rather than a full-brim or caped model, your ears and the back of your neck remain completely exposed to the sun. If you choose the Sun Tripper for exposed desert or alpine trails, you must pair it with a hooded sun shirt or be diligent about reapplying sunscreen to your neck and ears throughout the day. **Highlights** - Folding clamshell bill packs flat into compact pockets without deformation - UPF 50+ main body fabric shields the scalp and forehead - Side crown mesh panels vent heat cleanly off the temples - Integrated hidden interior pocket stores emergency cash or a key - Quick-adjust rear buckle provides a tailored, low-profile fit **Watch-outs** - Leaves ears and the back of the neck fully exposed to the sun - Best paired with a hooded sun shirt to compensate for limited coverage
Pros
- Clamshell folding bill stows flat in running vest pockets without deforming
- UPF 50+ main body fabric provides dense forehead and scalp defense
- Side mesh panels purge heat quickly away from the temples
- Low-profile crown stays stable in high winds without catching gusts
Cons
- Leaves the ears and back of the neck completely exposed to sunlight
- Mesh side crown panels are unrated for UPF and admit filtered UV rays
Best uses
- Trail running and fastpacking
- Sub-alpine hiking with tree cover
- Minimalist backcountry travel
- Pairing with hooded sun shirts
Specifications
- Weight
- 2.6 oz (74 g)
- UPF Rating
- UPF 50+ main fabric (mesh not rated)
- Brim Length
- 2.5 inches
- Closure Style
- Adjustable rear buckle with webbing
- Packability
- Split-folding clamshell bill
- Fabric
- 100% nylon main body, polyester mesh
Pricing
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Full catalog listing & offersBest for
Trail running and fastpacking, Sub-alpine hiking with tree cover, Minimalist backcountry travel, Pairing with hooded sun shirts
Where to buy the Sun Tripper Cap
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Not every trek calls for the wide, floppy circumference of a safari hat. For trail runners, fastpackers, and hikers moving under heavy tree canopy or through high-wind ridges, a full-brim hat can be an annoying sail that knocks against the top of your pack. The Sunday Afternoons Sun Tripper Cap bridges the gap between a standard ball cap and functional alpine gear, trimming bulk without ditching core sun protection across the forehead and face. The defining feature here is the split folding brim. Instead of using a rigid plastic board that creases or snaps when shoved into a pocket, the Sun Tripper utilizes a central hinge that allows the bill to fold cleanly in half. It collapses flat enough to slide into a running vest pocket, hip belt pouch, or jacket pocket without warping out of shape when deployed. The trade-off is straightforward: this is a baseball-style cap, not an all-around shield. Your ears and the nape of your neck remain completely vulnerable to direct exposure and reflected glare. If you plan to spend days on open slickrock or high-altitude ridges, you need to accept pairing this cap with a UPF sun hoodie or staying disciplined with sunscreen.
Target Audience and Trail Intent
The Sun Tripper is tailored for hikers and runners who find traditional wide-brim sun hats cumbersome. When you are scrambling up steep inclines or hiking with a tall multi-day pack, a broad brim inevitably brushes the top lid of your pack or catches crosswinds. This cap provides a low-drag profile that stays locked to your skull. It suits gram-conscious backpackers who already wear a hooded sun shirt and simply need a rigid visor to keep glare out of their eyes and protect their forehead. It is also an ideal travel piece because it resists crushing inside duffels. If you demand 360-degree standalone sun coverage, this cap will disappoint, but for minimalist travelers moving fast, it hits a very functional sweet spot.
Folding Brim Mechanics
The centerpiece of the Sun Tripper is its folding clamshell bill. Sunday Afternoons split the bill down the middle with a flexible fabric hinge, allowing the two stiff halves to fold together like a book. You can pull the cap off your head, fold it, and slide it directly into an active waist belt or the side stretch pocket of a pack in seconds. Traditional ball caps develop ugly kinks or broken internal stiffeners when mashed into luggage or pockets, but this bill retains its original curve every time you snap it back open. At two and a half inches, the bill is slightly shorter than oversized trucker caps, keeping it stable during sudden gusts of wind while still casting adequate shade over the eyes.
Ventilation and Moisture Handling
Thermoregulation is handled by two inset mesh panels along the sides of the crown. These panels sit right above the temples, allowing heat generated along the scalp to vent out into ambient air rather than trapping it against your head. Inside the rim, an integrated moisture-wicking sweatband pulls sweat off your brow before it can run into your sunglasses. The main body fabric uses a lightweight, breathable nylon weave treated with a water-repellent finish that resists light rain and prevents sweat from immediately staining the exterior. The mesh panels do let some unfiltered sunlight hit the sides of your head, which thin-haired hikers should note, but the airflow benefit in muggy conditions is immediately noticeable.
Fit and Internal Features
The cap features a low-profile crown that sits closer to the skull than a high-crown trucker. Sizing is dialed in via a rear webbing strap and flat-profile buckle that stays flush against the back of your head, meaning it will not create a pressure point if you rest your head against a pack or vehicle seat. Sunday Afternoons also integrated a small interior stash pocket inside the crown. It is large enough to hold folded emergency cash, a credit card, or a flat house key without causing discomfort. The crown construction uses five panels that contour naturally around most head shapes without creating awkward bunched fabric or points of tension above the ears.
Coverage Realities and Alternatives
The main limitation here is the obvious lack of ear and neck coverage. In high-exposure environments like the desert Southwest or above-treeline alpine routes, the Sun Tripper leaves too much skin exposed to serve as your sole sun barrier. Competing wide-brim options like the Outdoor Research Seattle Sombrero or Sunday Afternoons' own Ultra Adventure Hat provide vastly superior peripheral coverage. Closer competitors in the technical cap space include the Patagonia Duckbill Cap, which breathes better and packs lighter but lacks structural shape and UPF density in the body fabric. If you want structural sun defense without the footprint of a bucket hat, the Sun Tripper works best when treated as part of a system alongside a hooded base layer.
How we picked
We started with a long list of hiking sun hats that people actually buy, cut anything that could not clear our baseline for durability and field performance, then ranked the 10 that were left against the same criteria. Rankings are editorial. No brand pays for placement, and affiliate links never move a pick up or down.
- Real-world durability
- How the material, stitching, or steel holds up after a season of hard use — not how it looks new.
- Performance in bad conditions
- Wind, rain, cold, and grit are the test. Anything that only works on a nice day gets marked down.
- Weight and packability
- Every ounce has to earn its place in the pack, but not at the cost of something that fails in the field.
- Ease of use
- Setup, adjustment, and maintenance with cold hands, in the dark, without the manual.
- Value at its price point
- Compared against the closest competitors in the same tier, not against cheaper gear in a different class.
- Repairability and support
- Field-fixable design, available parts, and a warranty the maker actually honors.
Sun Tripper Cap — frequently asked questions
- Is the Sun Tripper Cap worth it?
- We rank it #9 in Hiking Sun Hats. The Sunday Afternoons Sun Tripper Cap is built for hikers, trail runners, and backpackers who hate the floppy circumference of wide-brim hats but still need serious sun protection. It takes the classic baseball cap silhouette and injects it with technical trail engineering, most notably a reverse-clamshell folding…
- What is the Sun Tripper Cap best for?
- Best for trail running and fastpacking, sub-alpine hiking with tree cover, minimalist backcountry travel and pairing with hooded sun shirts. Standouts: clamshell folding bill stows flat in running vest pockets without deforming and upf 50+ main body fabric provides dense forehead and scalp defense.
- What are the downsides of the Sun Tripper Cap?
- Leaves the ears and back of the neck completely exposed to sunlight and Mesh side crown panels are unrated for UPF and admit filtered UV rays.
- What are the key specs of the Sun Tripper Cap?
- Weight: 2.6 oz (74 g) · UPF Rating: UPF 50+ main fabric (mesh not rated) · Brim Length: 2.5 inches · Closure Style: Adjustable rear buckle with webbing · Packability: Split-folding clamshell bill
- Target Audience and Trail Intent — what should I know about the Sun Tripper Cap?
- The Sun Tripper is tailored for hikers and runners who find traditional wide-brim sun hats cumbersome. When you are scrambling up steep inclines or hiking with a tall multi-day pack, a broad brim inevitably brushes the top lid of your pack or catches crosswinds.
- Folding Brim Mechanics — what should I know about the Sun Tripper Cap?
- The centerpiece of the Sun Tripper is its folding clamshell bill. Sunday Afternoons split the bill down the middle with a flexible fabric hinge, allowing the two stiff halves to fold together like a book.
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