Poly Propylene Straight fiber Yarn

Polyprpalyne, (Poly Pro) is a fairy flexible fiber that is slightly lighter than water so it floats, barely.  I doesn't absorb water and repels water well so in that regards it floats well.  Not very flashy but the pale colors do reflect light in a natural way.  A 9 ft strand, small sections can be separated into thinner strands as needed.