Introduction: Compared to walking with two healthy limbs, walking with transtibial prosthesis results in a higher consumption of metabolic energy. Suitable prosthesis foot is chosen considering current state of patient’s activity, possibilities for progress and patients needs. The final choice is always a compromise, as every prostheses is not suitable for all activates and other requirements. The best prosthesis foot is the one which corresponds to patients needs at the moment of choice. Purpose: The purpose of diploma work is to compare prosthetic feet with solid ankle and padded heel, as well as energy storing and return prosthetic feet, regarding energy consumption, prosthesis functionality as for walking speed, self – selecting walking speed, stability, and steadiness of walking as well as length of the step in transtibial amputees. Methods: In diploma work we used descriptive and comparative method. Scientific articles were searched in PubMed, Science Direct, Google Scholar, Sage Journals and ?Research Gate database. For book literature we used library informational system COBISS. Literature was searched in Slovenian and English language in periods from April to August 2016, and from October to November 2018. We have selected literature published in the period from 2002 to 2018. Inclusion criteria: comparison between prosthetics feet, unilateral transtibial amputation, SACH, ESAR. Results: Statistically significant differences were not found regarding walking speed, self-selecting walking speed and length of the step in amputated leg. Statistically significant differences were found in evaluation of the perception of effort, energy consumption at a speed of 4, 8 km/h, in symmetric walking and stability. Discussion and conclusion: Energy storing and return prosthetic feet improve stability, symmetry of walking and users feel less strain using them. Compared to prosthetic feet with solid ankle and padded heel, prosthetic feet for storing and returning achieve better results in almost all research areas, even though results were not statistically significant. However, this should not be disregarded, as these features can improve quality of life in each individual.