401 Snow So Fine! Polyester Thread

401 Snow So Fine! Polyester Thread from Superior Threads is the ultra-fine invisible white — 50wt, matte, lint-free, for quilting that melts into the fabric with refined, delicate stitching.

Product Details

• Color: 401 Snow — the purest, coolest white in the So Fine! palette (402 Pearl is the warmer alternative)
• Weight: 50wt filament polyester — finer than 40wt Glide/Omni; matte finish; lint-free
• Spool: 3,280-yard king; the finer weight uses slightly less thread per stitch
• Best for: Heirloom and competition work, white-on-white, dense pantographs, and as a bobbin thread under heavier top threads
• Brand: Superior Threads — So Fine! line

Frequently Asked Questions

What does 50wt buy over 40wt?

Smaller, subtler stitches, less bulk in dense fill, and near-invisibility on the surface — the choice when the quilting should disappear entirely rather than show as a line.

Why do competition quilters reach for it?

Dense heirloom fills and micro-quilting look more refined in a fine matte thread — the texture reads, the thread doesn't.

Is it a good bobbin thread?

One of the most popular — including under heavier decorative top threads, where the fine bobbin side reduces bulk and tension fighting.

Does the fine weight need tension changes?

Some quilters back tension off slightly for 50wt; most find it consistent and easy across major longarm brands.

Snow or Pearl?

Snow for bright-white fabric and bleached batting; Pearl for warm whites and naturals.