Using super thin, light, anti-fleece and waterproof fabric with no chest-locking sewing technology, make winter more light and warm and comfortable;
Anti - velvet test: GB/T 12705-2 transcrate method

Sew the bag according to certain size and required down ratio, turn 1000 turns forward, reverse 1000 turns
The sum of the number of drill down roots is the number of drill down.

1, with good anti-drilling properties of less than 5 pieces
2, with anti-drilling velvet performance 6-15
3. Poor performance of anti-drilling pile > 15