If you have long pants these will work for a few minutes. I took a small 140 mile trip and only stopped at three places, upon boarding the bike after the third stop i saw one of the strap plastic clamp's had already broken. SAVE your money, they were nice while they lasted for the three hours of the day but i have many longer rides i do and these wont cut it.
I have used these for thousands of miles of riding. They work great. You can buy replacement parts, so if the clip or the strap breaks, you can still use the other parts instead of having to buy a whole new set. The straps are made of a heavy rubber, so they don't get all stretched out like elastic ones do.
Really hoped they worked, but after my first ride with them for 22 miles to my work, I was taking them off and one clasp broke. The pivot part is plastic and did not last one ride. Will continue to find a different clasp made of all metal.