For more sustainability most of the offered textiles on that page are coming with certificates of:

The cotton used comes from 100% organic cultivation. No genetic engineering is used, less water is used and no chemicals such as fertilizers or pesticides are used. The polyester content used in this textile consists of 100% recycled polyester - and is inserted in 2 layers of organic cotton to avoid direct skin contact.

The printings on all textiles are processed by Digital Transfer. There's no need of silkscreen / serigraph frames anymore - which is good for our environment.

This all alone won't save the planet -  but it makes things better for sure.

And that is as good as it gets and that feels good.