The bamboo is great.  Living in the Carolina heat and humidity, the breathability of the fabric is greatly appreciated.  Even compared to "breathable fabrics" like ex-officio give and go, this fabric is a revelation.  The cut of the briefs themselves is great and leading to all-day comfort, but as other reviewers have noted, the waist band is at touch snug.  These have certainly caused me to research other bamboo boxer options as they prevent it from feeling like a swamp down there.  Worth a shot, particularly at the price.