Description

Tired of boxy cuts, tight sleeves, and collars that cave? This shirt is the upgrade. Athlete-tapered through the torso with room where you lift (shoulders/chest) and clean where you lean (waist). Our luxe bamboo blend is insanely soft, breathable, and naturally temperature-regulating so you stay cool under pressure. It moves with you, drapes clean, and keeps its colour wash after wash. Look strong. Feel sharp. Zero compromise.

Sizing + Fit

Most customers size up one from their normal size.


Athletic taper + stretch = clean lines

 

Everyday comfort: Size up one for a relaxed, post-gym, all-day fit.

 

Sharp, close-to-body look: Go true to size.

 

Between sizes / broad up top: Size up one for extra room in chest & shoulders.

 

Tip: If you’re unsure, choose the larger size. Easy exchanges.

Material + Care Instructions

Crafted from a premium bamboo-spandex blend, our fabric is breathable, insanely soft, and built to move with you. It’s moisture-wicking, thermoregulating, and naturally odor-resistant — so you stay cool, dry, and sharp all day long.

 

• Cold wash only
• Wash inside out with similar colours
• Do not bleach
• Hang dry or lay flat — avoid the tumble dryer
• Cool iron if needed (do not iron print or labels)

Premium fabric deserves premium care — treat it right, and it’ll stay sharp wear after wear.

Shipping 

Shipping: Ships from Australia. Orders leave our warehouse within 48 hours. Standard delivery is ~4–7 business days Australia-wide. You’ll get tracking the moment it’s on the move.

 

Returns: We want you to love your Muscle Fit Bamboo Shirt. If you’re not completely satisfied, you can return it within 30 days of delivery for an exchange or refund. Items must be unworn, unwashed, and in original condition. Contact our support team to start a return.

500+ Positive Reviews!

Bamboo Muscle Shirt

Athlete-tapered. Bamboo-soft. Built to flex where you’re strong and clean up where you lean.

$119.95
$109.95
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Size Chart

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Flex Form Threads

Athletic Fit

4-Way Stretch

Soft Bamboo Blend 

Moisture Wicking

Other Brands

Boxy fit

Stiff Cotton

Rough Fabric 

Wet Patches

Title

free shipping $120+

Get your order delivered fast, Aus wide.

hassle-free returns

Not the perfect fit? Easy returns, no stress.

luxury muscle fit

Tailored for strength, crafted for style.

australian-owned

Authentically Australian, committed to quality.

 

 

The Hype is real

 

Discover why Flex Form Threads is every guys go to shirt. Our shirts accenuate the arms, chest and shoulders so you can stand out from the crowd. High quality and premium fabric.
Need we say more?

Why you'll love it

Finally—You Found The Perfect Shirt.

We didn’t just make another shirt... we created the muscle fit shirt. It instantly sharpens your look, boosts confidence, and turns heads. With ultra-soft, breathable fabric and a near-custom fit, it replaces every other shirt in your drawer.

Tailored for Athletic Builds

4-Way Stretch for Maximum Comfort

Breathable & Moisture-Wicking

Features

So Soft, You’ll Never Take It Off

Ultra-touchable from day one - no itchy tags.

A Fit That Makes 87% Of Guys Feel More Buff

We asked around, and this shirt hugs your arms and shoulders with just the right breathing room.

Built To Last — And Outlast. 

Premium bamboo fabric that keeps it's shape through countless wears. It's here to stay, not a throwaway.

Fit

Classic & Fitted

Snug through the arms, shoulders and chest. Tapered in the middle. Made to hold its shape over countless wears and washes.

Fabric

Best Of Both Worlds

Our signature bamboo-spandex blend delivers the ultra-soft feel and breathability, with a touch of stretch for all-day comfort, and a fit that moves with you. Durable, lightweight and designed to perform.

Care Guide

For best results wash in cold water, hang or lay flat and cool iron if needed.

better fit. better quality.

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Address:

Sydney, Australia

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