Although, the underlying concepts of ablative Composite Materials go back to antiquity the technology was essentially developed and most of the progress occurred in the last three decades. This development was accompanied by a proliferation of literature in the form of report, conference proceeding and journals but not available in the form of text book. Despite this plethora of literature, or because of it, we are constantly faced with dilemma when asked to recommend a single introductory text for beginning students and engineers. This has convinced me that there is a definite need for a simple and up-to-date introductory text book aimed at senior undergraduates, graduate students and engineers entering the field of ablative composite materials. This book is designed to meet the above needs as teaching text book and as a self study reference. It only requires knowledge of undergraduate's mechanic of materials, although some knowledge of rubber mechanical & especially its thermal properties might be helpful.