The paper on material defects of goods in commercial sales, which utilizes the Law on Obligations, the United Nations Convention on Contracts for the International Sale of Goods (CISG) and an article by Vedran Šoljan, analyzes material defects in the context of commercial sales. The analysis includes how the Law on Obligations defines material defects and what is considered a defect of the item, as well as examining the buyer's rights under the Law on Obligations. It considers the seller's responsibility for delivering the item and analyzes the legal deadlines within which the buyer must report defects and exercise their rights. The paper provides an overview of the conditions under which the CISG applies to international contracts for the sale of goods, compares the provisions of the CISG with those of the Law on Obligations, particularly in the context of material defects, and includes a detailed examination of the buyer's rights and the seller's obligations under the CISG. The paper also discusses theoretical aspects of material defects according to Vedran Šoljan's article, including case law cited by Šoljan, to illustrate problems and solutions in real situations. This kind of paper provides a comprehensive overview of the issue of material defects in commercial sales, highlighting the importance of understanding different legal frameworks.