Experience with steering tulips

Hi there, so slowly I think about my riding equipment for the upcoming winter. Last year it was damn cold here, at -18°C I had to stop on the 20km long track 3 times to thaw my fingers, despite 3 few gloves I have come across steering tulips now, which look modest but should bring something. Has anyone ever had experience with it? Would they of course wear these in combination with my winter gloves+ underdress gloves.http://www.louis.de/…/index.php?topic=artnr&%3Bartnr=10008345 Heating grips are not in question, as relatively expensive and not suitable. Does anyone else know good alternatives? Otherwise I am very well equipped, only my fingers are totally deaf in the winder. Thanks Greeting Raoul