iphone doesn't work with gloves on

I don't know if my phone is the only one but its getting cold and snowy here in chicago and when i try to answer the iphone by moving the slider with my glove on nothing happens. I have to take off my glove to turn it on. At first I thought oh thats because its a touch screen and thats how they all are but a second later with my glove back on I used my gps tom tom system to change an address.......