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The Rukka Outlast Shirt works to keep the wearer’s temperature not too hot... not too cold... but just right, over a broad range of environments and activity levels. When your activity level or the outside temperature increase, the Outlast thermocules that contain the phase-change paraffin begin to change from a solid to a liquid which provides you with a comfortable sensation of thermal equilibrium. The energy required to activate this process comes from your warm body or rising ambient temperatures.
When you begin to cool down, Outlast thermocules begin to change back from a liquid to a solid. In this phase change, the energy that was absorbed by the thermocules while you were active is returned to you.
Thin and Comfortable
This shirt is awesome, it keeps you warm even with a perforated leather jacket and because of how thin it is, it lets air circulate and keeps you cool when its warmer out.
April 24, 2014
The Rukka Outlast shirt is now my standard base layer shirt. Since purchasing the shirt, 20 days ago, I have worn the shirt on six subfreezing rides in comfort. I am confident that the shirt will perform just as well at the other end of the thermometer. I did purchase one size up, due to previous reviews, to add to the long ride comfort factor.
December 16, 2013
Pretty Good Product
This shirt seems to do exactly as advertised. I work in the O.R. and found myself pretty comfy. I would recommend going one size larger, if you are remotely on the top end of your size range. I would buy this shirt again. if it were a little less expensive, I would get 4 or 5.
October 21, 2013
I went for 4000 miles and not washed once in temperatures from 38 to 90 degrees. Not one problem and held up well.
October 2, 2013
Great in cold weather
I like traveling light so the Rukka shirt looked to be a good shirt to keep warm in winter and cool in summer. Bought an XL and sizing seemed American. Very, very light and easy packing. First time I wore it was on a wintry weather day(44 degrees - I live in Florida) with my Dainese jacket(liner in) and was quite comfortable zipping along at 65 mph. Haven't tested the hot weather side. I intend to pack 2 of these for long trips with the idea of washing overnight. It does dry quickly.
January 28, 2013
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S T: Have been wearing cotton T shirts under my for the past couple of years and wanted to try a new base layer that is advertised as being better than ran (admittedly) sweaty and clammy cotton T shirt. Will give it a try and if I like it will try Revit Glacier shirt as well.Sep 17, 2014
Sunbir W: Impressed with it's cuttting edge Space technology to be an all weather base layer. Hopefully this will be my comfort companion in all weather ridesJul 16, 2014
B B: All weather comfortable base layer. Have yet to try it on and see.Jun 5, 2014
Lee F: assist with keeping cool and keeping warm for riding in both California and Washington State.Apr 28, 2014
Raghavendra B:I am sorry I can't tell you about the "Dainese Dynamic cool tech ls shirt" but rukka one is really good. I sweat a lot so this shirt has worked really well. There is good air flow and don't make me smelly. I wear this when ever I go on a long drive and hot summer days.
I hope I was able to answer your question. May 13, 2014
Aaron S:The rukka is made more for changing weather conditions on long rides. I have work it from 30 degrees to 90 degrees comfortably. Not sweaty. Not overheating when it warmed up. But keeping me warm when cold. May 13, 2014