Allbirds
Allbirds
Allbirds
(CNN) —  

Allbirds, the sneaker brand much loved for its comfy knit kicks made from wool and recycled materials, is branching out into clothing. Last October, it launched a small but mighty collection of clothing: four well-designed nongendered basics — including a T-shirt, sweater, cardigan and puffer. And now the brand is expanding that collection with two brand-new T-shirts. The TrinoXO Classic Tee and TrinoXO Long-Sleeve Classic Tee are the latest additions to the line, which carries on Allbirds’ minimalist aesthetic (the company’s design philosophy, after all, is the “right amount of nothing”) with a lot of eco-friendly thinking.

Along with sustainability efforts comes consumer transparency, and Allbirds is making sure customers know what’s gone into each and every product, down to the energy used producing it. The company says it’s the first in the world to label each piece with its carbon footprint.

TrinoXO Classic Tee
Allbirds
TrinoXO Classic Tee

The newest addition to Allbirds’ clothing line is the women’s TrinoXO Classic Tee. It’s made from the brand’s TrinoXO material, which is actually made from discarded shells of marine life (yes, you read that right), which is Allbirds’ latest and greatest fiber innovation. These shells, according to the company, are the second-most abundant polymer on Earth, and they happen to be great for textiles. One of their major superpowers is that these shells have chitosan, which keeps clothing fresh for longer — and that means less washing for you (and more water for the environment). The Classic Tee offers a relaxed and flattering fit perfect for spring and is available now in six colors, three of which are limited edition and sizes XS through XXXL.

TrinoXO Long Sleeve Classic Tee
Allbirds
TrinoXO Long Sleeve Classic Tee

The TrinoXO Long-Sleeve Classic Tee is available for men and women, and brings Allbirds’ new material to a light and breezy style great for layering on those windy spring days. It’s available in four neutral colors and in sizes XS to XXXL.

Allbirds
Allbirds
Allbirds

Allbirds’ merino wool cardigan and “jumper” (or, to Americans, sweater) work with the material Allbirds made its name with. Expect a superfine fiber from this responsibly sourced wool and a cozy fit that’s just the right balance of stylish and oversized.

Allbirds
Allbirds
Allbirds

The TrinoXO Tee is one of Allbirds’ most popular items from this line, thanks to its innovative TrinoXO material. The shirt is super light, odor-reducing and available for both men and women, making it the perfect everyday tee.

Allbirds
Allbirds
Allbirds

Finally, the company’s Trino Puffer replaces the conventional oil-derived synthetics and down fill of your usual winter down jacket with a combination of Tencel and recycled polyester. It’ll keep you dry too: While many winter coats use a fluorine-based (read: toxic) water repellent for protection against drizzles and snow, this jacket has a fluorine-free durable water-repellent coating that does the job just as well. Add to all that engineering some classic good looks and you’ve got a timeless puffer that keeps you warm and dry.

The apparel, which comes in sizes XS to XXXL, starts at $48 for the TrinoXO Tee and goes up to $250 for the Wool Puffer, but you can rest assured that your investment will have big returns when it comes to quality and sustainability. Shop the clothes at Allbirds’ site now.