males or females between the 8 and 17 years of old.

clinical diagnosis of type 1 diabetes for at least one year. the subject will have been on insulin pump therapy for at least 3 months.

hba1c ≤ 11.0%.

clinically significant nephropathy, neuropathy or retinopathy as judged by the investigator.

severe hypoglycemic episode within two weeks of inclusion in the study. a severe hypoglycemic episode is defined as loss of conscience, seizure or a hospital emergency visit.

current use of oral glucocorticoid medication (except low stable dose according to investigator judgement). stable doses of inhaled steroids are acceptable.

known or suspected allergy to the trial products.

other serious medical illness likely to interfere with study participation or with the ability to complete the trial by the judgment of the investigator.

failure to comply with team's recommendations (e.g. not willing to use trial pump, etc).