This kit is thinner than the Bio-Racer stuff I had before, but the ankle zips went west after about ten wears on the BR bib tights, so I wanted something which would be more worth the outlay. These Altura leggings have been much more well-made. On these the seams and single tummy zip have been sturdy- I'm probably track rather than mountain width!- while the reflective decals do the job nicely. After the problem with the BR ankle zips I'd always go for zipless heel loops and these do the job nicely. The gusset lining is thick and absorbent and I've had no issues with chaffing, and it's handled machine washes with no evidence of damage. In short, a happy customer.