is it kosher to wear compression shorts under 2 inch split shorts?

The Book of Running 26:7

And Yahweh said to Abraham and Moses, thou shalt not wear compression shorts under split shorts unless thou renders his first born unto crossfit training.

So let it be written. So let it be done.

it's almost exclusively a high school look, mostly because the team issue shorts don't provide adequate support for your bangers and mash.

That said, wear what makes you comfortable. Why would I care? We all look like wackos out there anyways.

Only if you wear a head band and fanny pack

You are misinformed about the things you can and can not do while 'keeping kosher'. here is a primer.

http://www.myjewishlearning.com/article/what-does-it-mean-to-keep-kosher/

an overview of clothing restrictions

Clothing Mixtures:

The Commandment of Shatnez

For some reason, many people believe that it is forbidden to wear clothing that contains mixtures of different fibers.

This is incorrect.

However, the Torah does forbid us to mix linen and wool in our clothes. And wool refers specifically to the wool of sheep, lamb and rams. Other fibers, however, are absolutely permitted. Many fabrics today have mixed fibers and are not 100% any particular one material, and this is usually permitted, unless wool and linen (or wool products and linen products) are mixed.

It is easy to make claims, so I will cite a legal source, no less than the great Maimonides himself. The Rambam (Maimonides), in Hilchos Kilayim (Laws of Mixtures) Chapter 10, Law 1, says quite explicitly:

Nothing at all is forbidden in clothing mixtures except wool and linen mixed together. As it says in the Torah (Deuteronomy 22:11): Do not wear shaatnez, wool and linen together.

In other words, the Rambam is saying that the Torah states explicitly that shaatnez is wool and linen together, and not any other mixture. Any other mixture in clothing is permissible.

The Torah, as we see, is rather clear that shatnez refers specifically and only to wool and linen

pin racer wrote:

it's almost exclusively a high school look, mostly because the team issue shorts don't provide adequate support for your bangers and mash.

That said, wear what makes you comfortable. Why would I care? We all look like wackos out there anyways.

Which part is the bangers and which part is the mash?

It would only be kosher if you were circumcised.

80s bballer look wrote:

just wondering if the LRCers will make fun of me. anybody else do this?

As stated above, it's a pretty "high school" look. I'd look the other way for someone wearing team issued split shorts on top of full length tights if it was 20 degrees and snowing for their XC State meet. Can't think of a good reason to wear half tights under shorts. They make some pretty comfortable running specific briefs if you need the support, or just ditch the shorts all together and double up on compression short layers.

80s bballer look wrote:

just wondering if the LRCers will make fun of me. anybody else do this?

LRCers will make fun of anything.

Unless, of course, you go out and blister a sub-14 5K...

Then all the LRCers will think this is the best thing going.