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Aiden Sielias (they/them pronouns) started Undercover Otter in 2011, when they started hand dyeing yarn. Initially, for themselves and as their skills improved and methods got more refined, they got custom orders.

The enjoyment Aiden gets from experimenting with fibers, yarn and colors made them decide to start their own business. In 2018, Aiden quit their boring office job and became a full-time indie dyer. It was a gamble, but so far they're loving it.

It didn't take long for the dyeing to spiral out of hand and Aiden moved from a 8 square meter room in their apartment to a dye studio they had to outfit themselves.

Undercover Otter yarns have been featured at Vogue Knitting Live in New York, Edinburgh Yarn Festival in Scotland, Oslo Strikkefestival in Norway, the Amsterdam Yarn Festival and Woollinn Yarn Festival in Ireland.

Undercover Otter yarn is available on our own website and at a select group of retailers worldwide. For all retail addresses, please check out the stockist page.



Bright saturated colors and strange names characterize our yarns. When dyeing we experiment with different methods to get the effect we want a colorway to have. That means that the resulting colorways can have up to 6 layers of dye, in a multitude of techniques.

Our big love, next to fiber, is horror and science fiction. We link all our colorway names to those genres. Resulting in strangely named colorways like ‘Your Mother Darns Socks in Hell’.

We get our inspiration from classic horror movies, modern gore-fests and post-apocalyptic science fiction. We are not saying that all the movies, books, plays and music that inspire us are great. Some of them are stinkers. But we are suckers for terrible movies in which you see more red food coloring than actual acting.




Undercover Otter is queer owned and operated.
We believe in, and support, your right to be you!
No matter who you are, where you live, what your heritage is, who you love, how your body is shaped, how you define your gender, or what your abilities are:

You. Are. Awesome.

We are united with our customers and employees in standing for what is right. We will acknowledge the truth. We will always strive to be better.

We expect our customers, employees, collaborators and business partners to be equally awesome to each other, and the world around them.

There is no room for hate at Undercover Otter.
Stay Awesome! (to each other)