ÃÛÌÒTV

The observation of thermal emission from isolated neutron stars (INSs) and the modeling of the corresponding cooling curves has been very useful to get information on the properties of matter at very high densities. More recently, the detection of quiescent thermal emission from NSs in low mass X-ray binary systems (LMXBs) after active periods opened a new window to the physics of matter at lower densities. I will present results for a few sources that have been recently monitored and will show how the models can be used to establish constraints on the crust composition and their transport properties, depending on the astrophysical scenarios assumed.