For bulky, dense knits, the ball‑point tip separates fibres rather than cutting them, helping prevent holes and runs. Size 100/16 is appropriate for thick fleece and structured double knits on most household machines. Ideal for hemming sweaters, hoodies and thick rib cuffs using polyester or poly/cotton thread. Choose the largest size that still sews cleanly with your fabric and thread. Choose needle size according to fabric weight for best results.