New Arrivals
Our Biggest Sale Ever is now on!
Save up to 40% now!
Deal ends 12/1!
Let customers speak for us
The company’s policy on sustainability is very impressive. The way the shirt came looked professional and luxurious. The shipment was fast and the owner was so helpful and kind. Since I got the shirt with Instagram giveaway, I enjoy the service but I can say the shirts are expensive for my budget.
Mustafa Tuncay
Simsek Clothing Co.
The quality of the shirt is really good. I really like how it fit my body and it did not disturb me at all. Actually, the feeling of the fabric was really soft and it is very comfortable. You can definitely see the difference of a luxurious shirt when you compare with your ordinary shirts in terms of fabric quality, feeling, and the fit. Highly recommend it.
Mustafa Tuncay
Men's Lightning Thermal Base Layer Top
This has been a great fitting shirt, I personally love that the shirt is cut long so that you can bend over without the shirt riding up.
Jesse H
Men's Lightning Long Sleeve T-shirt
Answers all your questions quickly and politely
someone who loves his job
Ali Canturk
Simsek Clothing Co.
Extremely comfortable shirt and the material wicks away moisture and I found it not even getting slightly stinky after a full workout session with the shirt on. 10/10 shirt
Parker Wilson
Men's Lightning Short Sleeve T-Shirt
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Fall/Winter 2025
A collection of base layers made from the finest fibers; bridging luxury, sustainability and performance.
Available in limited quantities.
We use the gear we make. That's why every Simsek product comes with Lightning Guarantee.
Free Guide
Get our 100% free Ski Dress Guide!
A free guide for you to get ready for the day on the slopes! Deep dive on what to wear and how to choose those layers.
Perfect for beginners!
Every product sold plants 5 trees, as part of our sustainability commitment.
New Arrivals
The Base Layer Edit
We asked: How can something this simple feel this refined?
For most people, a base layer is just a base layer. For us, it’s a design challenge — to perfect the foundation piece. Every seam, stitch, and fiber is considered.
Crafted from ultra-fine Australian Merino, it delivers exceptional softness, breathability, and durability — without sacrificing simplicity.
We believe true performance doesn’t have to be loud. It’s felt — in comfort that lasts, in details you don’t have to think about, and in the confidence of craftsmanship done right.
Our Mission
Born in and inspired by Boston
When our founder moved to Boston, his closet wasn't ready. Going out was intimidating.
Now we offer luxurious and adaptable clothing to help you get out there without fear.