Watermelon American Flag Shirt for Men — Watermelon Sam Spark all-over print flat lay
Watermelon American Flag Shirt for Men — Watermelon Sam Spark styled on model
shirt print detail — Watermelon Sam Spark
button-down collar detail — Watermelon Sam Spark Hawaiian shirt
shirt fabric detail
Watermelon American Flag Shirt for Men — Watermelon Sam Spark all-over print flat lay
Watermelon American Flag Shirt for Men — Watermelon Sam Spark styled on model
shirt print detail — Watermelon Sam Spark
button-down collar detail — Watermelon Sam Spark Hawaiian shirt
shirt fabric detail

4th of JulyWatermelon Sam Spark Cuban 4th of July Hawaiian Shirt for Men

$89.99 $44.99 -50%
POPULAR over people have bought this product in the last 24 hours.
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Slip into resort-ready ease with our Watermelon Sam Spark Cuban 4th of July Hawaiian Shirt — an open-collar, vintage-inspired silhouette featuring an all-over print of pointing Uncle Sam portraits, juicy watermelon wedges, firecrackers, red blooms, and blue leafy accents. The clean white background makes every detail pop, giving this 4th of july hawaiian shirt a cheerful patio-party look.

The relaxed Cuban (camp) collar opens cleanly without buttons at the top, giving a Havana-meets-California vibe that feels right at beach cookouts, holiday cruises, and rooftop fireworks nights. It's a men's Hawaiian shirt that transitions effortlessly from poolside to beachfront restaurant. The Watermelon Sam Spark Cuban 4th of July Hawaiian Shirt is made for men who like their patriotic style bold, playful, and unmistakably summer-forward, with a print that nods to classic American celebration cues while keeping the mood relaxed and vacation-friendly.

Explore more: Patriotic Hawaiian Shirts · America 250 Shirts · 4th of July Shirts

  • All-over print: Uncle Sam portraits, watermelon wedges, and firecrackers give this patriotic hawaiian shirt a vacation-ready spark.
  • Open Cuban (camp) collar — boxy, retro silhouette built for warm weather
  • Lightweight, breathable fabric with a soft hand feel
  • Reinforced stitching and durable button-front closure
  • Sizes XS – 5XL — big and tall friendly
  • Machine wash cold, tumble dry low

Built For: beach cookouts, resort weekends, holiday cruises, poolside fireworks, rooftop drinks, summer vacations

Part of the Patriotic collection at Shirtboom — independent aloha shirts designed in the USA, made for bold prints under $50. The Watermelon Sam Spark Cuban Hawaiian Shirt brings together Uncle Sam, watermelon, red flowers, and firecracker artwork for a relaxed 4th of july hawaiian shirt made to feel festive from coast to coast.

How does this men's Hawaiian shirt fit?
The Watermelon Sam Spark shirt has a relaxed men's fit. Please refer to the size chart above for full chest and length measurements before choosing.
Can I wear it as a 4th of July shirt for guys?
Yes — this 4th of July Hawaiian shirt is built for BBQs, parades, fireworks nights, and summer gatherings with its Uncle Sam and firecracker print. It is also a strong match for best dad ever american flag shirt.
Is this an american flag shirt eagle design?
No eagle appears in this print. The Watermelon Sam Spark design focuses on Uncle Sam, watermelon slices, firecrackers, and patriotic color.
What fabric is this USA button down shirt?
This usa button down shirt is made with lightweight fabric suited for warm weather. Machine wash cold and tumble dry low for easy care.
Do you offer big and tall sizes?
Yes. The Watermelon Sam Spark 4th of July Hawaiian Shirt is available XS through 5XL, with a relaxed cut that works well for big-and-tall shoppers.
What is your return and shipping policy?
Shirtboom ships to the USA and supports returns according to the policy on the product page, so you can order your patriotic Hawaiian shirt confidently.

Shipping Info

Processing Time

All orders are processed within 1 – 2 business days. This includes the time needed to prepare your items, transfer them to our warehouse, and package them with your name and address before shipment.

Shipping Time

FREE STANDARD SHIPPING - ON ORDERS OVER $79.00

Shipping Method Estimated Delivery Window Costs
Standard shipping $6.99

During periods of high demand or extreme weather, shipments may be delayed slightly.

Tracking Number

Once your order has left our warehouse, we will send you the tracking number with the confirmation email so that you can track the package online. For international shipping, tracking may stop once the package is handed over to the country's international carrier.

Return & Exchange

If for some reason you are not happy with your purchase, we will gladly work with you to correct the problems. Items can be returned/exchanged and refunded within 30 days of receiving the product, in the unlikely event of a damaged, defective, or wrong item delivered to you.

Choose Your Style

Classic collar

Classic Collar

Daily Wear

A timeless printed shirt style with a clean and versatile collar shape. Perfect for everyday wear, casual outings, vacations, and smart-casual occasions while showcasing the same standout all-over print design.

  • Same printed design with a classic collar silhouette
  • Best for everyday styling
  • Great with jeans, chinos, and shorts
  • Recommended if you want a safe classic choice
Cuban collar

Cuban Collar

Most Popular

A relaxed printed shirt style with an open resort-inspired collar. Ideal for beach vacations, summer parties, BBQs, and holiday looks, featuring the same bold all-over print in a more laid-back silhouette.

  • Same printed design with a relaxed open collar
  • Best for summer and vacation vibes
  • Perfect for standout prints
  • Recommended if you want the signature look

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• Safe Payments

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1. Real-time order tracking. Once your order ships, you'll receive an email with a tracking number. Follow your package end-to-end at Track Your Order.

2. Package protection. If your package is lost, damaged, or stolen in transit, we'll resend the item or issue a full refund — no questions, no return required. Just contact us within 30 days of the ship date.

3. Discreet packaging. Orders ship in plain mailers without product images or pricing on the outside.

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Size Guide

Relaxed Hawaiian fit. This shirt is designed with extra room through the chest and body.

  • Choose your usual size for a classic relaxed vacation fit.
  • If you are between sizes or prefer a cleaner fit, we recommend sizing down.
  • If you have broad shoulders, a larger chest, or prefer extra room, choose your usual size.

Measurements are garment measurements, not body measurements.

Fit Feedback

Real measurements from real ShirtBoom customers — use this to gauge how our sizes wear on different body types.

CustomerChestWaistWeightHeightSuggested SizeExpected Fit
Tyler G**104cm / 41″91cm / 36″81.6kg / 180lb173cm / 5′8MGreat / Relaxed
Marcus C**99cm / 39″71cm / 28″72.5kg / 160lb175cm / 5′9XSClean Fit
Daniel P**104cm / 41″84cm / 33″72.5kg / 160lb178cm / 5′10SGreat / Clean Relaxed
Jordan W**99cm / 39″104cm / 41″80kg / 176lb163cm / 5′4LLoose
Eric S**110cm / 43.3″100cm / 39.3″85kg / 187lb173cm / 5′8XLLoose
Size Chart
SizeChestShoulder WidthBottom OpeningShirt LengthSleeve Length
XS43″17.8″41″29″9.2″
S45.5″18.5″43.5″29.5″9.5″
M48″19.0″46″30″9.8″
L50.5″19.8″48.5″31″10.2″
XL53.5″20.8″51.5″32″10.5″
2XL56″21.8″54″33″10.9″
3XL59″22.8″57″34″11.3″
4XL62″23.8″60″35″11.6″
5XL65″24.5″63″36″11.9″
SizeChestShoulder WidthBottom OpeningShirt LengthSleeve Length
XS109451047423
S116471107524
M122481177625
L128501237926
XL136531318127
2XL142551378428
3XL150581458629
4XL157601528929
5XL165621609130
How to Measure
Shirt measurement diagram with 5 numbered measurements

1. Chest

Measure the full circumference around the chest at the fullest part, just under the arms — keep the tape level all the way around.

2. Shoulder Width

Measure straight across the back, from one shoulder seam to the other shoulder seam.

3. Bottom Opening

Measure the full circumference around the bottom hem opening of the shirt — all the way around, not just edge to edge.

4. Shirt Length

Measure from the highest point of the shoulder seam straight down to the bottom hem.

5. Sleeve Length

Measure from the shoulder seam down the outside of the sleeve to the cuff edge.

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