Inclusion Criteria:
* 1\. Cisgender female aged 18-49 years old, inclusive, at screening based on self-report.
2\. Sexually active, defined as having penile-vaginal sex at least once a week, on average, over the past three months with the same male partner, and intends to continue having sexual intercourse at the current frequency for at least three months.
3\. Healthy based on medical history, physical exam (including pelvic exam with visual inspection) at screening.
4\. Using effective non-vaginal method of contraception (oral contraception, injectable, patch, IUD, sterilization, male condoms) 5. Competent to provide written informed consent based on Investigator's assessment.
6\. Agrees to not participate in any other clinical research involving investigational or marketed products for the duration of this trial.
Exclusion Criteria:
* 1\. Known or suspected allergy to silicone or EVA, as reported by participant. 2. Positive pregnancy test at screening or enrollment based on urine hCG test. 3. Positive for HIV at screening based on rapid test per site SOPs. 4. Presence of any clinically significant genital epithelial findings (e.g. abrasions, ulcerations, lacerations, or vesicles) at screening.
5\. Positive chlamydia, gonorrhea, or trichomoniasis test at screening. 6. Symptomatic vulvovaginal candidiasis, bacterial vaginosis (BV), or urinary tract infection (UTI) at screening. (Participants who are symptomatic at initial screening will be referred for testing and treatment and may be reconsidered for eligibility after completing treatment and/or if no longer symptomatic).
7\. Presence of genital abnormalities on visual exam with speculum that would contraindicate IVR use.
8\. History of significant uterine or vaginal prolapse, or urethral obstruction. 9. Unexplained vaginal bleeding per self-report within the last three months. 10. Currently breastfeeding per self-report. 11. Partial or complete hysterectomy per self-report. 12. History of gynecological surgery in the six months prior to screening per self-report.
13\. Within six weeks post abortion or six months postpartum, per self-report. 14. Using vaginal contraception (diaphragm, female condom, spermicide, IVR). 15. Known current drug abuse, including illicit drugs, or alcohol abuse. 16. Any other condition the clinician feels would jeopardize the health and wellbeing of the participant after assessing the participant's potential eligibility for the study.
17\. Unable to comply with study requirements, including but not limited to, attending all study visits and using the IVRs as directed.
18\. Participation in any other clinical research trial involving investigational or marketed products currently or within one month of participation prior to screening, including any trial of a spermicide, microbicide and/or drug.
