The Cassius- Merino Athletic Tee
The performance tee that wicks like polyester — without the plastic, the smell, or the microplastic shedding.
5×
Wear It Five Times
Between washes
℃
Temp-Regulating
Cool in heat, warm in cold
∅
Odour-Resistant
Naturally antibacterial
♺
Zero Plastic
100% biodegradable
Naturally Grown
100% Merino
Travel Tested
|
Raglan sleeves with full shoulder mobility. Relaxed through the body. Runs one size larger in the chest than The Bruce — size down for a slimmer fit. Model is 6 '1 and wears a large.
The Cassius- Merino Athletic Tee
Sale price$90 USD
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The Cassius- Merino Athletic Tee
Sale price$90 USD
Most brands ask you to trust their marketing. I'm asking you to trust five generations.
My family has grown Merino wool since 1880 — that's a lot of seasons. We know this fibre works.
I wore my shirts for fourteen days across three countries without a single wash, so I know the fibre does the work better than any marketing can.
If it's not the best shirt you own within 30 days, send it back and I'll refund you — no questions, no forms, no fuss. But I don't think you'll need to.
— Jock Merriman, Founder.
The Fibre
Everything merino does. Nothing added.
Soft
Superfine fibres that never itch — nothing like your grandfather's wool.
Odour-resistant
Days of wear between washes. Genuinely.
Breathable
Moves moisture off your skin as vapour, not sweat.
Temperature-regulating
Cool in Tuscan heat, warm in Dublin drizzle. Same shirt.
Fast-drying
Sink-wash at 9pm, dry by morning.
Wrinkle-resistant
Hang it tonight; wear it tomorrow. No iron.
Natural & biodegradable
Grown, not made. No plastic, no microplastics shed.
UV-protective
Natural sun protection cotton can't match.
The long version lives in The Merino Field Guide.
The Math
A merino gym tee that lasts longer than the polyester one — without the plastic.
| The Cassius | Cotton Tee | Polyester Tee | |
| Wears per wash | 3–5 | 1 | 1 |
| Years of regular wear | 4–6 | 1–2 | 1 |
| Holds odour? | No | Yes | Yes (worse) |
| Hot & cold weather? | Both | Cool only | Neither |
| Microplastics per wash | None | None | 100,000+ |
| Cost per year (5 yrs) | $18 | $20 | $32 |
The performance tee that's actually clothing — not a plastic bottle.
Fabric & Construction +
Lightweight 100% superfine Australian Merino jersey. Breathable, fast-drying, and odour-resistant through repeat workouts.
Fit & Sizing +
Athletic fit, slightly tapered. True to size. View full size guide →
Care +
Wash cold on wool cycle. Lay flat to dry, never tumble. Full care guide →
The Story +
Built for movement, named in the family tradition — merino, reimagined for the gym.
The Common Questions
Order
Our sheep are shorn every 12 months. This creates the perfect length of fiber for spinning into yarn and knitted into fabrics.
Not if you take the right steps. Merino is an 'active' fiber, which means the composition can be changed by heat and friction. These can cause the scales on the fibres to interlock, causing the garment to shrink.
Yes, we ship all over the world. Shipping costs will apply, and will be added at checkout. We run discounts and promotions all year, so stay tuned for exclusive deals.