What kind of yarn is the 'nepp yarn' mentioned in the t-shirt description?

After seeing the statement in the product description that nepp yarn was used to create a scratchy, faded texture, I wondered how the fabric differs from regular cotton t-shirts.

hmmm editorial answer

It is a yarn made so that grain-like textures appear on the surface by leaving small clumps or thick slubs during the spinning process.

Unlike regular yarn that is smoothly finished, it has small slubs and clumps mixed across the surface. Yarn twisted without filtering out tangled fiber grains when spinning, or deliberately blending them in, is called nepp yarn. This is why a texture forms where millet-sized specks or lumps appear irregularly scattered over the fabric surface.

RYOO's Neff 1/2 t-shirts Charcoal option is woven with this nepp yarn, giving it a scratchy feel to the touch and showing a faded texture like worn-in clothes^[1]. The material composition blends cotton 85% and modal 15%^[2]. It is a combination designed so that the garment falls flexibly without being stiff by adding modal, while preserving the bumpy texture of the clumped-fiber nepp yarn.

Official product page ↗Neff 1/2 t-shirts [Charcoal]₩83,000

Unanswered questions

The thickness of the nepp yarn and the specific fabric weight have not yet been confirmed.