Guide
How to Find a Sun Hat That Fits a Big Head
Verdict. XL/XXL fits 24.8"-25.6", 63-65 cm on the UVCoolix hat, and 24.8"-26", 63-66 cm on the waterproof boonie. The straw fedora lists S, M, L, XL with no head-size range.
Which size should you open?
UVCoolix Neck Flap Wide Brim Hat
Cool-touch fabric, a 3.1" brim and a 9.4" neck flap, in sizes up to a 25.6" head.
M/L, L/XL, XL/XXL (XL/XXL fits 24.8"-25.6", 63-65 cm)
| Size | Listing |
|---|---|
| M/L | M/L |
| L/XL | L/XL |
| XL/XXL | XL/XXLXL/XXL fits 24.8"-25.6", 63-65 cm |
Comhats Waterproof Boonie Hat
Waterproof UPF 50+ nylon with a mesh crown, in sizes that go up to a 26" head.
S/M, M/L, L/XL, XL/XXL (XL/XXL fits 24.8"-26", 63-66 cm)
| Size | Listing |
|---|---|
| S/M | S/M |
| M/L | M/L |
| L/XL | L/XL (Army Green only) |
| XL/XXL | XL/XXLXL/XXL fits 24.8"-26", 63-66 cm |
Who is each hat for, and who should skip it?
UVCoolix Neck Flap Wide Brim Hat
Best for
Hiking and fishing
This is the hat for long, exposed days on the trail or the water when your head is too big for the usual one-size hats. The brim is 3.1 inches and the neck flap runs 9.4 inches down the back. The sweatband, crown and inner flap use a cool-touch fabric that feels cool on contact without soaking it first. It comes in head sizes up to 25.6 inches, and a back drawcord lets you fine-tune the fit.
- UPF 50+ nylon; the listing says it blocks 98% of UVA and UVB rays.
- 3.1" brim plus a 9.4" neck flap that covers ears and neck.
- Cool-touch sweatband, crown and neck-flap lining (88% nylon, 12% spandex).
- Six mesh eyelets for airflow and a moisture-wicking lining.
- Brim can be folded or rolled for packing and springs back to shape.
- Adjustable chin strap and back drawcord.
M/L, L/XL, XL/XXL (XL/XXL fits 24.8"-25.6", 63-65 cm)
Pros
- One of the few sun hats with a true XL/XXL size (63-65 cm), not just a "fits most" band.
- The neck flap is built in, so there is nothing to clip on or lose.
- Fish-camo and print colorways give anglers something other than plain khaki.
Cons
- The neck flap is fixed; you can't take it off on cooler or shadier days.
- Hand wash only.
- The 3.1" brim is narrower than the 4" brims on some wide-brim hats.
Comhats Waterproof Boonie Hat
Best for
Big heads, wet days
If you need a sun hat for big heads that also handles rain, this boonie is the simple pick. It's waterproof nylon rated UPF 50+, with a 3-inch brim, a mesh crown and four eyelets to let heat out. The largest size fits heads from 24.8 to 26 inches, bigger than most hats go. You can snap the sides of the brim up for a cowboy-style look, then crush the whole hat into a pocket when you're done.
- Waterproof 100% nylon, UPF 50+; the listing says the 3" brim blocks 97.5% of UV rays.
- Mesh crown and four eyelets for ventilation.
- Brim sides button up for a cowboy-hat look, or stay down as a boonie.
- Crushable and light enough to fold into a pocket.
- Elasticized locking drawcord at the back to adjust fit.
- Four sizes: S/M, M/L, L/XL and XL/XXL (up to 26" / 66 cm).
S/M, M/L, L/XL, XL/XXL (XL/XXL fits 24.8"-26", 63-66 cm)
Pros
- A good fit for readers who find even most XL hats tight.
- Works as both a rain hat and a sun hat, so it covers wet and dry days.
- Plain, low-key design that suits fishing, hiking and yard work alike.
Cons
- No neck flap, so the back of your neck stays exposed.
- Hand wash with cool water and air dry only.
- In L/XL, the only color we can link to is Army Green.
Comhats Big Head Straw Fedora
Best for
Beach and travel
Not every big-head hat has to look like trail gear. This Panama-style paper-straw fedora is cut for larger heads and has an adjustable hook-and-loop band inside for a snug fit. The weave lets heat escape, and the wide brim shades your face and neck. It folds into a suitcase and regains its shape when you unpack, which makes it an easy choice for beach trips, cruises and outdoor weddings.
- 100% paper straw with a ventilated weave.
- Internal adjustable hook-and-loop band for fine-tuning the fit.
- Wide brim that shades the face and neck.
- Packable; regains its shape after travel.
- Unisex Panama trilby styling for casual or dressier outfits.
- Sizes S, M, L and XL.
S, M, L, XL
Pros
- A dressier option for big heads who want something other than a boonie or bucket hat.
- The inner band lets you fix a slightly loose fit without extra padding.
- Light enough to wear all day at the beach or on a boat.
Cons
- The listing gives no UPF rating.
- After packing, it may need steaming or a quick iron to remove creases.
- The listing doesn't give head measurements for each size.
The size rows above use the head-size note only where the size line gives one.
Which UVCoolix size has a head measurement?
XL/XXL fits 24.8”-25.6”, 63-65 cm. M/L and L/XL are listed with no range.
Which boonie size has a head measurement?
XL/XXL fits 24.8”-26”, 63-66 cm. S/M, M/L, and L/XL are listed with no range.
What sizes does the straw fedora list?
S, M, L, XL. No head-size range is given for those sizes.
What does the brand list for this hat?
Noted September 24, 2026. These lines repeat features from the brand listing. This site did not run a lab test.
| UVCoolix Neck Flap Wide Brim Hat | M/L, L/XL, XL/XXL (XL/XXL fits 24.8"-25.6", 63-65 cm) |
|---|---|
| Comhats Waterproof Boonie Hat | S/M, M/L, L/XL, XL/XXL (XL/XXL fits 24.8"-26", 63-66 cm) |
| Comhats Big Head Straw Fedora | S, M, L, XL |
Sources
Specs are taken from each hat's Amazon listing.