Background: In 2020, Malawi had 6.9 million malaria cases and 2551 deaths, mainly in children under five years of age. The 2017-2022 Malawi malaria control strategic plan promoted the consistent use of insecticide-treated nets through free distribution and mass campaigns. Despite widespread availability of the control strategy plan, Chikwawa District continues to suffer from high malaria burden especially among under five children, due to inconsistent insecticide-treated (ITN) net usage. For this reason, this study aimed at exploring caregivers' perceptions on insecticide-treated net utilisation and also find out about its effectiveness among those who consistently use them., Methods: This study used a sequential exploratory mixed methods design. The data used for quantitative analysis was drawn from the population of under-five children's caregivers within the catchment area of Chikwawa district hospital. The sample size was 96 participants, as determined by Cochran's formula. The data collection lasted from December 2023 to April 2024 and included four in-depth interviews and three focus group discussions to address the objectives qualitatively., Results: The study revealed that 91.67% of households used ITNs, with 87.50% using them daily. The significant factors influencing ITN utilisation included the number of nets, user satisfaction, perceived impact, user habits, acquisition method, and usage frequency (all p values < 0.001). Under-five malaria cases were also significant (p = 0.025). The odds of the perceived net impact influencing utilisation were 4.956 times greater. Non-usage was due to heat, quality concerns, limited access, breathing difficulties, health conditions such as asthma, and misconceptions about net treatment., Conclusion: The study revealed a strong belief in insecticide-treated net efficacy. However, some challenges such as access, durability, and misinformation of insecticide-treated nets were discovered. These challenges affected utilisation of insecticide-treated nets in agreement with some literature reviewed. The insights found in this study will help policymakers in addressing health interventions for the reduction of malaria cases in Malawi., Competing Interests: Declarations Ethics approval and consent to participate Permission to conduct this study was obtained from the Parul institute of public health technical review committee, reference number PIPH/FOM/PU/2023–2024/319, and from the Malawi national health sciences research committee (NHSRC), protocol number 24/02/4339, approval number 4339. Clearance was obtained from the Chikwawa district health directorate before the commencement of the study activities. Permission was also sought from local leaders verbally before they entered their villages. Before data collection, informed consent was obtained from each study participant to ensure voluntary participation. All necessary information about the study, including its purpose, risks, and benefits, was explained to the participants. Furthermore, the study participants were told that they had the right to withdraw from the study at any point during the study period. Those participants who agreed to be interviewed were requested to sign or thumbprint the informed consent form. Competing interests The authors declare no competing interests., (© 2024. The Author(s).)