Inclusion Criteria:

• Age ≥ 21 years old (legal age of maturity in Singapore)
• Male or female
• Informed consent
• Patients have undergone a mastectomy with or without reconstruction or breast-conserving surgery.
• Histological confirmation of breast carcinoma (invasive or in situ carcinoma)
• Patients are scheduled to receive hypofractionated (40Gy in 15 daily fractions or 26Gy in 5 daily fractions) photon-based RT
• Patient treated with or without tissue the addition of equivalent bolus and/or boost.
• Can communicate in English or be aided by a translator.

Exclusion Criteria:

• Prior RT to any portion of the planned treatment site.
• Patients will receive partial breast external beam RT, proton beam therapy, or brachytherapy.
• Patients with active rash, pre-existing dermatitis, or other conditions within the treatment area may make skin assessment for the study difficult per treating physician discretion.
• Known history of adhesive, tape or silicon allergy or sensitivity.
• Concomitant cytotoxic chemotherapy
• Bilateral breast pathology requiring concurrent bilateral breast or chest wall RT.
• Current inflammatory breast cancer or gross dermal involvement at initiation of RT.
• Patient has a Karnofsky Performance Status score <60.