A few sewing techniques that aren't common knowledge can make a difference in how hems on towels turn out. After taking so much time designing a beautiful towel, the goal is to have a hem that is equally attractive.
The techniques I use avoid some common complaints such as flared hems, rippling hems, and weft threads unraveling or poking out from the ends of the hems.
The first thing I do is serge apart my group of towels before wet finishing, leaving a thread tail of about 1 1/2" - 2" at each end. Serger chains tend to unravel, so an overhand knot on the chain somewhere will allow the chain to stay intact during wet finishing. Many of the machine stitches on a sewing machine will work also if a serger isn't available, but the ends should be very secure so the weft doesn't unravel.
Wet finish using standard instructions for your yarn type. Dry and steam press.
Pull the tail onto the first hem crease, pulling a tiny corner of the towel into the hem.
Pick a thread color that is the least conspicuous when placed across the cloth and thread the sewing machine.
Do not sew over pins, unless you like to fix snagged warp or weft threads, purchase new needles or to pay for your machine to be timed again.
If you don't have a lot of control of your machine speed, you may want to use something other than your finger to do the pushing. Pierced fingertips will leave blood on your pretty towel!
Remove pins before you get to them, keeping stripes or pattern aligned until the other end of the hem is reached.
As you get close to the end, the beginning process will be repeated. If you didn't turn in the other chain and tiny corner when turning up the hem, do so now.
When you reach the end, put the needle down one thread from the edge, pivot, align the edge and sew to the bottom corner, and reverse to the top of the hem.