Purchased for approximately 13 USD in the white Small size.  I am 5'4" 126lbs and B cup. I generally purchase a medium in tops but after reading the reviews I purchased a small.  It still fit a bit bigger both in the trunk and sleeves.  The material is a slick polyester blend.  I was looking for something more in line with the Adidas Climalite line and this isn't really the same at all in terms of texture.  It's comfortable enough and soft however the side trunk tag is a huge annoyance which needs to be snipped.  I purchased this for use outdoors for sports and gardening in the south texas summer heat to protect my arms and skin and it does make it a bit more tolerable without causing me to overheat from wearing long sleeve. The material in white is not completely see through but a bit opaque.  My gray colored bras are noticeable let alone any other darker colored undergarments.