Look for "non-stretch", often labelled "extra-sensitive", meaning the fisherman can feel every little nibble since there's no "give" to the line; to us it means reaction time somewhat better than 1/4 lap! Usually woven or "fusion", etc. Lotsa brands, colors, weights, prices to choose from. Spiderwire was my first, but also have used Spectra. Watch the prices; some get really spendy, others are really cheap. Cheaper is better.