I have owned the Immersion Research (IR) short sleeve Comp top for years. It only sees the light of day when it warms up here in the UK. The cag is a short sleeved version of the Comp top and shares all of its features with the exception of the obvious (long sleeves and latex cuff seals). After years of loyal service I fancied a changed. Nothing wrong with the Comp, just wanted something new. Now as it turns out the search for a high specification short sleeved dry or semi-dry top is actually quite a hard one. The number of manufacturers offering such a top as part of their current line up is quite small. So after much searching and considering the few alternatives Immersion Research came to my rescue with the Arch Rival.