For sweaters with the 'handmade' look and feel.. knit on 2gg and 1/2gg or 3gg using a drop-needle stitch technique or why not, actually hand knit.
The yarn count 550 is obtained by twisting 4 plies of our roving GRS certified, minimum quantity 8kg.
For very young sweaters with a great handcrafted flavor, that surely satisfies the needs of respecting our planet.