The Irish Trinity Long Sleeve

Sizing can be tricky, so there's a full measurements chart on every product page. Because Comfort Colors are garment-dyed and preshrunk, we recommend sizing up if you're between sizes or just prefer a roomier, lived-in fit. Our long sleeves come in S–3XL.

We print on Comfort Colors 6014 — the heavyweight, garment-dyed, 100% ring-spun cotton long sleeve that's considered the gold standard for vintage-feel shirts. Soft from day one, preshrunk, and made to get better with every wear.

Right here in the USA. Every shirt is printed to order and ships from within the US, so nothing sits in an overseas warehouse or travels across the world to reach you.

Yes — same company, same two people, same shop. Isle & Glen is simply the new name.

Triangle Threads is where we started. We began by designing shirts for America’s National Parks and the wild places we love to explore.

Ireland and Scotland were always our other great passion, and somewhere along the way that passion took over and became the full-time thing. Isle & Glen grew out of it.

So if you spot Triangle Threads on a package, an email, or somewhere on this site — that’s still us. Same family, same care, same shop. Just a name that finally matches what we love making most.

Every shirt is printed to order just for you. Orders usually ship within a few business days, and delivery takes another 3-5 business days — most land on your doorstep within a week. Shipping is always free on orders over $75.

Yes, within 24 hours of placing it. Every shirt is printed to order, so after that it's usually already in production. Just email us at support@isleandglen.co with your order number and what you'd like to change.

If anything arrives damaged, defective, or just not quite right, email us at support@isleandglen.co within 30 days and we'll make it right with a replacement or a refund — no questions asked.

Email us at support@isleandglen.co or use our contact page. We reply within 24 hours, and usually within 12.